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

src/x64/builtins-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 1035 matching lines @@
     __ CmpObjectType(rbx, FIRST_SPEC_OBJECT_TYPE, rcx);
     __ j(above_equal, &shift_arguments);
 
     __ bind(&convert_to_object);
     {
       // Enter an internal frame in order to preserve argument count.
       FrameScope scope(masm, StackFrame::INTERNAL);
       __ Integer32ToSmi(rax, rax);
       __ Push(rax);
 
-      __ Push(rbx);
-      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+      __ movp(rax, rbx);
+      ToObjectStub stub(masm->isolate());
+      __ CallStub(&stub);
       __ movp(rbx, rax);
       __ Set(rdx, 0);  // indicate regular JS_FUNCTION
 
       __ Pop(rax);
       __ SmiToInteger32(rax, rax);
     }
 
     // Restore the function to rdi.
     __ movp(rdi, args.GetReceiverOperand());
     __ jmp(&patch_receiver, Label::kNear);
@@ skipping 199 matching lines @@
     __ j(equal, &use_global_proxy);
 
     // If given receiver is already a JavaScript object then there's no
     // reason for converting it.
     STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
     __ CmpObjectType(rbx, FIRST_SPEC_OBJECT_TYPE, rcx);
     __ j(above_equal, &push_receiver);
 
     // Convert the receiver to an object.
     __ bind(&call_to_object);
-    __ Push(rbx);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    __ movp(rax, rbx);
+    ToObjectStub stub(masm->isolate());
+    __ CallStub(&stub);
     __ movp(rbx, rax);
     __ jmp(&push_receiver, Label::kNear);
 
     __ bind(&use_global_proxy);
     __ movp(rbx,
             Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
     __ movp(rbx, FieldOperand(rbx, GlobalObject::kGlobalProxyOffset));
 
     // Push the receiver.
     __ bind(&push_receiver);
@@ skipping 543 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64