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

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index 5ebb70ed8bc6b41a73196ceb006bf8174733e854..daff32fe945822265cadd7ad8404754f26d4a257 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -2675,8 +2675,10 @@ static void EmitSlowCase(MacroAssembler* masm,
 static void EmitWrapCase(MacroAssembler* masm, int argc, Label* cont) {
   // Wrap the receiver and patch it back onto the stack.
   { FrameScope frame_scope(masm, StackFrame::INTERNAL);
-    __ Push(a1, a3);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    __ Push(a1);
+    __ mov(a0, a3);
+    ToObjectStub stub(masm->isolate());
+    __ CallStub(&stub);
     __ pop(a1);
   }
   __ Branch(USE_DELAY_SLOT, cont);