JS: declare names for native declaration in root scope, to avoid clashing between inner names and global native names. Fix KT-14806

js/js.translator/testData/box/nameClashes/nativeAndTopLevelFunction.js

@@ -0,0 +1,3 @@
+function foo() {
+    return "O";
+}

js/js.translator/testData/box/nameClashes/nativeAndTopLevelFunction.kt

@@ -0,0 +1,8 @@
+package test
+
+@native fun foo(ignore: dynamic): String
+
+@JsName("foo")
+fun foo() = "K"
+
+fun box() = foo(0) + foo()

js/js.translator/testData/box/nameClashes/nativeDeclarationAndLocalVar.js

@@ -0,0 +1,6 @@
+function foo() {
+    return "global foo;";
+}
+function bar() {
+    return "global bar;";
+}

js/js.translator/testData/box/nameClashes/nativeDeclarationAndLocalVar.kt

@@ -0,0 +1,14 @@
+package test
+
+@native fun foo(): dynamic
+
+@native fun bar(): dynamic
+
+fun box(): String {
+    val foo = "local foo;"
+    val bar = "local bar;"
+    val result = foo + test.bar() + test.foo() + bar
+    if (result != "local foo;global bar;global foo;local bar;") return "fail: $result"
+
+    return "OK"
+}