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

#KT-35655 Fixed

compiler/testData/debug/localVariables/receiverMangling/capturedThisField.kt

@@ -11,11 +11,19 @@ fun box() {
     x.Bar()
 }
 
-// EXPECTATIONS
+// EXPECTATIONS JVM JVM_IR
 // test.kt:10 box:
 // test.kt:4 <init>:
 // test.kt:10 box:
 // test.kt:11 box: x:Foo=Foo
 // test.kt:5 <init>:
 // test.kt:11 box: x:Foo=Foo
-// test.kt:12 box: x:Foo=Foo
+// test.kt:12 box: x:Foo=Foo
+
+// EXPECTATIONS JS_IR
+// test.kt:10 box:
+// test.kt:4 <init>:
+// test.kt:11 box: x=Foo
+// test.kt:5 <init>:
+// test.kt:5 <init>:
+// test.kt:12 box: x=Foo