[JS IR] Support per-file mode and ES modules

compiler/testData/codegen/box/enum/kt18731_2.kt

@@ -1,3 +1,4 @@
+// SKIP_DCE_DRIVEN
 
 enum class Bar {
     ONE {

compiler/testData/codegen/box/properties/lazyInitializationPure.kt

@@ -1,36 +0,0 @@
-// TARGET_BACKEND: JS_IR
-// PROPERTY_LAZY_INITIALIZATION
-
-// FILE: A.kt
-
-val a = "A"
-
-// FILE: B.kt
-val b = "B".let {
-    it + "B"
-}
-
-val c = b
-
-// FILE: C.kt
-val d = "D".let {
-    it + "D"
-}
-
-val e = d
-
-// FILE: main.kt
-
-fun box(): String {
-    // Get only e to initialize all properties in file
-    e
-    return if (
-        js("a") === "A" &&
-        js("typeof b") == "undefined" &&
-        js("typeof c") == "undefined" &&
-        js("d") === "DD" &&
-        js("e") === "DD"
-    )
-        "OK"
-    else "a = ${js("a")}; typeof b = ${js("typeof b")}; typeof c = ${js("typeof c")}; d = ${js("d")}; e = ${js("e")}"
-}

compiler/testData/codegen/box/properties/lazyInitializationThroughTopFun.kt

@@ -3,7 +3,10 @@
 // PROPERTY_LAZY_INITIALIZATION
 
 // FILE: A.kt
+var result: String? = null
+
 val a = "a".let {
+    result = "OK"
     it + "a"
 }
 
@@ -13,5 +16,5 @@ fun foo() =
 // FILE: main.kt
 fun box(): String {
     val foo = foo()
-    return if (js("typeof a") == "string" && js("a") == "aa") "OK" else "fail"
+    return result!!
 }

compiler/testData/codegen/box/properties/noInitializationLazilyOnNonPropertiesCall.kt

@@ -5,6 +5,7 @@
 
 // FILE: A.kt
 val a1 = "a".let {
+    throw Error()
     it + "a"
 }
 
@@ -39,5 +40,5 @@ fun box(): String {
     C.values()
     C.valueOf("OK")
     val baz = b
-    return if (js("typeof a1") == "undefined") "OK" else "fail"
+    return "OK"
 }

compiler/testData/codegen/box/regressions/kt10143.kt

@@ -1,3 +1,5 @@
+// TODO: Investigate ES modules issue
+
 // FILE: Outer.kt
 
 package another