[JS_IR] Try to find generated default stub fun before creating a new one

This change is required to support a new approach to lowering
execution. There will be no more guarantee that every module
will execute `JsDefaultArgumentStubGenerator` lowering before
moving on.

#KT-63073

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsDefaultArgumentStubGenerator.kt

@@ -64,6 +64,7 @@ class JsDefaultArgumentStubGenerator(context: JsIrBackendContext) :
     }
 
     private fun IrFunction.introduceDefaultResolution(): IrFunction {
+        context.mapping.defaultArgumentsDispatchFunction[this]?.let { return it }
         val irBuilder = context.createIrBuilder(symbol, UNDEFINED_OFFSET, UNDEFINED_OFFSET)
 
         val variables = hashMapOf<IrValueParameter, IrValueParameter>()