[NI] Don't discriminate Nothing-type from resulting ones

^KT-32106 Fixed

compiler/testData/diagnostics/tests/inference/implicitInvokeExtensionWithFunctionalArgument.kt

@@ -25,5 +25,5 @@ fun test(s: SelectorFor<State>): Double {
     val e = s { return p1 }
     e checkType { _<AbstractSelector<State, Nothing>>() }
 
-    <!OI;UNREACHABLE_CODE!>return<!> null!!
+    <!UNREACHABLE_CODE!>return<!> null!!
 }

compiler/testData/diagnostics/tests/inference/nothingType/inferArgumentToNothingFromNullConstant.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_EXPRESSION -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -UNUSED_VALUE
+
+class Out<out T : Any>(result: T?)
+
+fun main() {
+    val a = Out(null)
+
+    <!DEBUG_INFO_EXPRESSION_TYPE("Out<kotlin.Nothing>")!>a<!>
+
+    var b: Out<Int>? = null
+    b = a
+}

compiler/testData/diagnostics/tests/inference/nothingType/inferArgumentToNothingFromNullConstant.txt

@@ -0,0 +1,10 @@
+package
+
+public fun main(): kotlin.Unit
+
+public final class Out</*0*/ out T : kotlin.Any> {
+    public constructor Out</*0*/ out T : kotlin.Any>(/*0*/ result: T?)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/inference/nothingType/lambdaNothingAndExpectedType.kt

@@ -1,12 +1,12 @@
-// !LANGUAGE: +NewInference
+// !WITH_NEW_INFERENCE
 // !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
 
 fun <K> select2(x: K, y: K): K = TODO()
 fun <K> select3(x: K, y: K, z: K): K = TODO()
 
 fun test2(f: ((String) -> Int)?) {
-    val a0: ((Int) -> Int)? = select2({ it -> it }, null)
-    val b0: ((Nothing) -> Unit)? = select2({ it -> <!UNUSED_EXPRESSION!>it<!> }, null)
+    val a0: ((Int) -> Int)? = select2(<!TYPE_MISMATCH!>{ <!OI;CANNOT_INFER_PARAMETER_TYPE!>it<!> -> <!OI;DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>it<!> }<!>, null)
+    val b0: ((Nothing) -> Unit)? = select2(<!TYPE_MISMATCH!>{ <!OI;CANNOT_INFER_PARAMETER_TYPE!>it<!> -> <!OI;DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>it<!> }<!>, null)
 
     select3({ it.length }, f, null)
 }