Generate meaningful bytecode names for extension receivers in INDY lambdas

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/indy/LambdaMetafactoryArguments.kt

@@ -446,7 +446,7 @@ internal class LambdaMetafactoryArgumentsBuilder(
         var newParameterIndex = 0
 
         newValueParameters.add(
-            oldExtensionReceiver.copy(lambda, newParameterIndex++, Name.identifier("\$receiver")).also {
+            oldExtensionReceiver.copy(lambda, newParameterIndex++, oldExtensionReceiver.name).also {
                 oldToNew[oldExtensionReceiver] = it
             }
         )