[JS IR] Emit original names for local vars to sourcemaps

#KT-35655 Fixed

compiler/testData/debug/localVariables/localFunUnused.kt

@@ -18,14 +18,13 @@ fun box() {
 //   - the _declaration_ of the local function does not figure in the byte code
 //     of the outer function and hence, has no line number
 
-// EXPECTATIONS
 // EXPECTATIONS JVM
 // test.kt:10 box:
 // test.kt:5 foo:
 // test.kt:7 foo: $fun$bar$1:TestKt$foo$1=TestKt$foo$1
 // test.kt:11 box:
 
-// EXPECTATIONS JVM_IR
+// EXPECTATIONS JVM_IR JS_IR
 // test.kt:10 box:
 // test.kt:7 foo:
-// test.kt:11 box:
+// test.kt:11 box: