[builtins] Refactor Invoke to deal with any kind of callable.

src/arm64/simulator-arm64.cc

Index: src/arm64/simulator-arm64.cc
diff --git a/src/arm64/simulator-arm64.cc b/src/arm64/simulator-arm64.cc
index f4e483915b8fe2abaf7088c8a7f174223b683089..4e6a9d91e1a99d323b3094b8bc486ef954397834 100644
--- a/src/arm64/simulator-arm64.cc
+++ b/src/arm64/simulator-arm64.cc
@@ -178,13 +178,13 @@ double Simulator::CallDouble(byte* entry, CallArgument* args) {
 
 int64_t Simulator::CallJS(byte* entry,
                           Object* new_target,
-                          JSFunction* func,
+                          Object* target,
                           Object* revc,
                           int64_t argc,
                           Object*** argv) {
   CallArgument args[] = {
     CallArgument(new_target),
-    CallArgument(func),
+    CallArgument(target),
     CallArgument(revc),
     CallArgument(argc),
     CallArgument(argv),
@@ -193,6 +193,7 @@ int64_t Simulator::CallJS(byte* entry,
   return CallInt64(entry, args);
 }
 
+
 int64_t Simulator::CallRegExp(byte* entry,
                               String* input,
                               int64_t start_offset,