Avoid HeapObject check in HStoreNamedField.

src/x64/macro-assembler-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 "v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "bootstrapper.h"
 #include "codegen.h"
@@ skipping 906 matching lines @@
 
 void MacroAssembler::Store(const Operand& dst, Register src, Representation r) {
   ASSERT(!r.IsDouble());
   if (r.IsInteger8() || r.IsUInteger8()) {
     movb(dst, src);
   } else if (r.IsInteger16() || r.IsUInteger16()) {
     movw(dst, src);
   } else if (r.IsInteger32()) {
     movl(dst, src);
   } else {
+    if (r.IsHeapObject()) {
+      AssertNotSmi(src);
+    } else if (r.IsSmi()) {
+      AssertSmi(src);
+    }
     movp(dst, src);
   }
 }
 
 
 void MacroAssembler::Set(Register dst, int64_t x) {
   if (x == 0) {
     xorl(dst, dst);
   } else if (is_uint32(x)) {
     movl(dst, Immediate(static_cast<uint32_t>(x)));
@@ skipping 4276 matching lines @@
   if (ms.shift() > 0) sarl(rdx, Immediate(ms.shift()));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64