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

js/js.translator/testData/box/expression/cast/unsafeVarianceCast.kt

@@ -0,0 +1,21 @@
+abstract class Foo<out E> {
+    abstract fun foo(element: @UnsafeVariance E): Boolean
+}
+
+class Bar<E : C> : Foo<E>() {
+    override fun foo(element: E): Boolean {
+        if (element !is C?) return false
+        return true
+    }
+}
+
+open class C
+
+open class D : C()
+
+fun box(): String {
+    val a = (object{})
+    val foo: Foo<Any?> = Bar<D>()
+    if (foo.foo(a as Any?)) return "fail"
+    return "OK"
+}