KT-2752: refactor generation of FQN in JS. Move backend-independent code to generic code in frontend.

js/js.translator/testData/box/native/nativePropertyWithCustomName.kt

@@ -19,8 +19,8 @@ fun box(): String {
 
     if (foo + bar != OK) return "$foo + $bar != $OK"
 
-    val actualAsString = funToString("actual")
-    val expectedAsString = funToString("expected")
+    val actualAsString = funToString("actual_0")
+    val expectedAsString = funToString("expected_0")
     if (actualAsString != expectedAsString) return "$actualAsString != $expectedAsString"
     if (actual("asd", "12345") != "asd12345") return "${actual("asd", "12345")} != \"asd12345\""
 

js/js.translator/testData/box/native/passExtLambdaFromNative.js

@@ -3,5 +3,5 @@ function A(v) {
 }
 
 function nativeBox(b) {
-    return b.bar(new A("foo"), function(i, s) { return "" + this.v + s + i })
+    return b.bar_0(new A("foo"), function(i, s) { return "" + this.v + s + i })
 }

js/js.translator/testData/box/native/undefined.kt

@@ -14,7 +14,7 @@ fun box(): String {
 
     val b: dynamic = object {val bar = ""}
     assertEquals(b.foo, undefined)
-    assertNotEquals(b.bar, undefined)
+    assertNotEquals(b.bar_0, undefined)
 
     return "OK"
 }