rra/ilgonmic/revert-signatures-changes

[JS IR] Fix line number test

[JS IR] Ignore isInstance repl test

[JS IR] Ignore isInstance repl test

[JS IR] Add test with unsafe variance

Revert "[JS IR] Optimize away upcasts"

This reverts commit 8149189585.

Get rid of duplicated signatures

Revert "[JS IR] Consider erasing type parameters in return type in js signatures"

This reverts commit 6adcbe081e.

Revert "rra/ilgonmic/exported-bridges-2 [JS IR] Use js name for signature"

This reverts commit 00289d35

[JS IR] Leave as is

[JS IR] Add test with overloading by generic

[JS IR] Add test from master

[JS IR] Add tests from master

Merge-request: KT-MR-5987
Merged-by: Ilya Goncharov <Ilya.Goncharov@jetbrains.com>

^KT-51700 fixed
^KT-51523 fixed
^KT-51685 fixed

compiler/testData/codegen/boxError/semantic/missedBody.kt

@@ -4,9 +4,9 @@
 // MODULE: lib
 // FILE: t.kt
 
-fun bar(a: String, b: String): Any
+fun bar(a: String, b: String): String
 
-fun foo(): Any {
+fun foo(): String {
     return bar("O", "K")
 }
 
@@ -17,4 +17,4 @@ fun box(): String {
     val r = foo()
     if (r is String) return r
     return "OK"
-}
+}