[runtime] Initial step towards switching Execution::Call to callable.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index f04316c3b2098f3f6148d7a143b00883b3cbc8b4..91db4c61f962fd032506dd0e4f2a9f9563f60624 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -593,9 +593,7 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
       CallConstructStub stub(masm->isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
       __ CallStub(&stub);
     } else {
-      ParameterCount actual(rax);
-      // Function must be in rdi.
-      __ InvokeFunction(rdi, actual, CALL_FUNCTION, NullCallWrapper());
+      __ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
     }
     // Exit the internal frame. Notice that this also removes the empty
     // context and the function left on the stack by the code