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

src/arm64/simulator-arm64.h

Index: src/arm64/simulator-arm64.h
diff --git a/src/arm64/simulator-arm64.h b/src/arm64/simulator-arm64.h
index cd734ad29ee38a543a823bdb3f797167cc4a62fa..e4d9a81ffdbe3d04305726efa911a83a8faaea37 100644
--- a/src/arm64/simulator-arm64.h
+++ b/src/arm64/simulator-arm64.h
@@ -188,7 +188,7 @@ class Simulator : public DecoderVisitor {
   // which set up the simulator state and grab the result on return.
   int64_t CallJS(byte* entry,
                  Object* new_target,
-                 JSFunction* func,
+                 Object* target,
                  Object* revc,
                  int64_t argc,
                  Object*** argv);