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

#KT-35655 Fixed

compiler/testData/debug/localVariables/jvmOverloads.kt

@@ -1,3 +1,4 @@
+// TARGET_BACKEND: JVM
 // WITH_STDLIB
 // FILE: test.kt
 class C {
@@ -9,9 +10,9 @@ fun box() {
     C().foo(4)
 }
 
-// EXPECTATIONS
-// test.kt:9 box:
-// test.kt:3 <init>:
-// test.kt:9 box:
-// test.kt:5 foo: firstParam:int=4:int, secondParam:java.lang.String="":java.lang.String
+// EXPECTATIONS JVM JVM_IR
 // test.kt:10 box:
+// test.kt:4 <init>:
+// test.kt:10 box:
+// test.kt:6 foo: firstParam:int=4:int, secondParam:java.lang.String="":java.lang.String
+// test.kt:11 box: