[stubs] Unify (and optimize) implementation of ToObject.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 7d717015ab15eafca2e406bcd00bbe0aeded2864..3ab60c8d8cc64b61e5c1c05114690f536f90addd 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -1964,8 +1964,8 @@ static void EmitWrapCase(MacroAssembler* masm,
   // Wrap the receiver and patch it back onto the stack.
   { FrameScope frame_scope(masm, StackFrame::INTERNAL);
     __ Push(rdi);
-    __ Push(rax);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    ToObjectStub stub(masm->isolate());
+    __ CallStub(&stub);
     __ Pop(rdi);
   }
   __ movp(args->GetReceiverOperand(), rax);