Fixed build error on x64.

Review URL: http://codereview.chromium.org/339027


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3151 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/macro-assembler-x64.cc

@@ -1800,7 +1800,7 @@ void MacroAssembler::EnterExitFrame(ExitFrame::Mode mode, int result_size) {
   ASSERT(ExitFrameConstants::kSPOffset == -1 * kPointerSize);
   push(Immediate(0));  // saved entry sp, patched before call
   if (mode == ExitFrame::MODE_DEBUG) {
-    push(Immediate(Smi::FromInt(0)));
+    push(Immediate(0));
   } else {
     movq(kScratchRegister, CodeObject(), RelocInfo::EMBEDDED_OBJECT);
     push(kScratchRegister);