[Wasm] Fix unit issues

- Materialize unit when its value is actually needed.
- Special-case Unit_getInstance return type at codegen. It should be a
  proper Unit object instead of a "void"

compiler/testData/codegen/box/arrays/forInReversed/reversedOriginalUpdatedInLoopBody.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: STDLIB_COLLECTIONS
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 import kotlin.test.*

compiler/testData/codegen/box/arrays/forInReversed/reversedReversedOriginalUpdatedInLoopBody.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: STDLIB_COLLECTIONS
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 import kotlin.test.*

compiler/testData/codegen/box/arrays/kt594.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 package array_test
 
 fun box() : String {

compiler/testData/codegen/box/arrays/nonLocalReturnArrayConstructor.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: INLINE_ARRAY_CONSTRUCTOR
 typealias ArrayS = Array<String>
 
 fun testArray() {

compiler/testData/codegen/box/casts/mutableCollections/asWithMutable.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: EXCEPTIONS_NOT_IMPLEMENTED
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 

compiler/testData/codegen/box/casts/mutableCollections/reifiedAsWithMutable.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: EXCEPTIONS_NOT_IMPLEMENTED
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 

compiler/testData/codegen/box/casts/unitAsAny.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun println(s: String) {
 }
 

compiler/testData/codegen/box/casts/unitAsSafeAny.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun println(s: String) {
 }
 

compiler/testData/codegen/box/casts/unitNullableCast.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun foo() {}
 
 fun bar(): Int? = foo() as? Int

compiler/testData/codegen/box/classes/kt1918.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 class Bar {
 }
 

compiler/testData/codegen/box/classes/overloadUnaryOperator.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: STDLIB_COLLECTIONS
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 class ArrayWrapper<T>() {

compiler/testData/codegen/box/closures/capturedVarsOptimization/withCoroutinesNoStdLib.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: COROUTINES
 // WITH_RUNTIME
 // WITH_COROUTINES
 import helpers.*

compiler/testData/codegen/box/controlStructures/kt2597.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun box(): String {
     var i = 0
     {

compiler/testData/codegen/box/dataClasses/toString/unitComponent.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 data class A(val x: Unit)
 
 fun box(): String {

compiler/testData/codegen/box/dataClasses/unitComponent.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 data class A(val x: Unit)
 
 fun box(): String {

compiler/testData/codegen/box/diagnostics/functions/tailRecursion/tailCallInBlockInParentheses.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 // DONT_RUN_GENERATED_CODE: JS
 
 tailrec fun foo(x: Int) {

compiler/testData/codegen/box/functions/kt1649_2.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 interface A {
     val method : () -> Unit?
 }

compiler/testData/codegen/box/functions/kt3214.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 class A {
     fun get(vararg x: Int) = x.size
 }

compiler/testData/codegen/box/functions/localFunctions/localExtensionOnNullableParameter.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 open class T(var value: Int) {}
 
 fun localExtensionOnNullableParameter(): T {

compiler/testData/codegen/box/inference/coercionToUnitWithLastLambdaExpression.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 
 fun <T> myRun(action: () -> T): T = action()
 fun foo(): String = "foo"

compiler/testData/codegen/box/inference/noCoercionToUnitWithEqualityConstraintForNullableReturnType.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 
 class Inv<T>(val x: T?)
 

compiler/testData/codegen/box/inlineClasses/boxUnboxOfInlineClassForCapturedVars.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 // !LANGUAGE: +InlineClasses
 
 inline class UInt(private val value: Int) {

compiler/testData/codegen/box/ir/kt25405.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun <T> tableView(init: Table<T>.() -> Unit) {
     Table<T>().init()
 }

compiler/testData/codegen/box/ranges/forInProgressionWithIndex/forInWithIndexReversed.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: STDLIB_COLLECTIONS
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 

compiler/testData/codegen/box/regressions/kt5953.kt

@@ -1,5 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
+// WASM_MUTE_REASON: STDLIB_COLLECTIONS
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
 

compiler/testData/codegen/box/secondaryConstructors/withNonLocalReturn.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 inline fun run2(block: () -> Unit) = block()
 
 class A {

compiler/testData/codegen/box/secondaryConstructors/withReturn.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 class A {
     val prop: Int
     constructor(arg: Boolean) {

compiler/testData/codegen/box/secondaryConstructors/withReturnUnit.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 class A {
     val prop: Int
     constructor(arg: Boolean) {

compiler/testData/codegen/box/unit/UnitValue.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun foo() {}
 
 fun box(): String {

compiler/testData/codegen/box/unit/closureReturnsNullableUnit.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun isNull(x: Unit?) = x == null
 
 fun box(): String {

compiler/testData/codegen/box/unit/kt3634.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 val c = Unit
 val d = c
 

compiler/testData/codegen/box/unit/kt4212.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun foo(): Any? = bar()
 
 fun bar() {}

compiler/testData/codegen/box/unit/kt4265.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun <T : Any, R> T.let(f: (T) -> R): R = f(this)
 
 fun box(): String {

compiler/testData/codegen/box/unit/nullableUnit.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun isNull(x: Unit?) = x == null
 
 fun <T : Any> isNullGeneric(x: T?) = x == null

compiler/testData/codegen/box/unit/nullableUnitInWhen3.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun foo() {}
 
 fun box(): String {

compiler/testData/codegen/box/unit/unitClassObject.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 fun box(): String {
     Unit
 

compiler/testData/codegen/box/when/noElseExhaustiveUnitExpected.kt

@@ -1,5 +1,3 @@
-// DONT_TARGET_EXACT_BACKEND: WASM
-// WASM_MUTE_REASON: UNIT_ISSUES
 enum class En {
     A,
     B