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

#KT-35655 Fixed

compiler/testData/debug/jsTestHelpers/jsWithStdlibTestHelpers.kt

@@ -0,0 +1,13 @@
+// This file is compiled into each stepping test only if the WITH_STDLIB directive IS specified.
+
+package testUtils
+
+import kotlin.collections.AbstractMutableMap
+
+@Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+internal val stdlibFqNames = mapOf(
+    Pair::class to "kotlin.Pair",
+    Triple::class to "kotlin.Triple",
+    HashMap::class to "kotlin.collections.HashMap",
+    AbstractMutableMap.SimpleEntry::class to "kotlin.collections.AbstractMutableMap.SimpleEntry"
+)