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

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index 1426f15858b896dcac70c392f612b97ffeb431ca..f7cf1470e456bb35b2b71deb1dd1a827331fe3b1 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -1309,8 +1309,10 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     {
       FrameScope scope(masm, StackFrame::INTERNAL);
       __ SmiTag(a0);
-      __ Push(a0, a2);
-      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+      __ Push(a0);
+      __ mov(a0, a2);
+      ToObjectStub stub(masm->isolate());
+      __ CallStub(&stub);
       __ mov(a2, v0);
 
       __ pop(a0);
@@ -1545,8 +1547,8 @@ static void Generate_ApplyHelper(MacroAssembler* masm, bool targetIsArgument) {
     // Convert the receiver to a regular object.
     // a0: receiver
     __ bind(&call_to_object);
-    __ push(a0);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    ToObjectStub stub(masm->isolate());
+    __ CallStub(&stub);
     __ mov(a0, v0);  // Put object in a0 to match other paths to push_receiver.
     __ Branch(&push_receiver);