X64: Convert smis to holding 32 bits of payload.

src/x64/virtual-frame-x64.cc

Index: src/x64/virtual-frame-x64.cc
diff --git a/src/x64/virtual-frame-x64.cc b/src/x64/virtual-frame-x64.cc
index 0726b50f6c6e3551dd1f543d044203425b56b300..fcb7463b65a3694f2b2d59f43af1eb4bb76dbe4f 100644
--- a/src/x64/virtual-frame-x64.cc
+++ b/src/x64/virtual-frame-x64.cc
@@ -65,7 +65,7 @@ void VirtualFrame::Enter() {
 #ifdef DEBUG
   // Verify that rdi contains a JS function.  The following code
   // relies on rax being available for use.
-  Condition not_smi = masm()->CheckNotSmi(rdi);
+  Condition not_smi = NegateCondition(masm()->CheckSmi(rdi));
   __ Check(not_smi,
            "VirtualFrame::Enter - rdi is not a function (smi check).");
   __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rax);
@@ -197,6 +197,14 @@ void VirtualFrame::EmitPush(Immediate immediate) {
 }
 
 
+void VirtualFrame::EmitPush(Smi* smi_value) {
+  ASSERT(stack_pointer_ == element_count() - 1);
+  elements_.Add(FrameElement::MemoryElement());
+  stack_pointer_++;
+  __ Push(smi_value);
+}
+
+
 void VirtualFrame::EmitPush(Handle<Object> value) {
   ASSERT(stack_pointer_ == element_count() - 1);
   elements_.Add(FrameElement::MemoryElement());
@@ -841,7 +849,7 @@ void VirtualFrame::SyncElementByPushing(int index) {
 
   switch (element.type()) {
     case FrameElement::INVALID:
-      __ push(Immediate(Smi::FromInt(0)));
+      __ Push(Smi::FromInt(0));
       break;
 
     case FrameElement::MEMORY:
@@ -1005,7 +1013,7 @@ Result VirtualFrame::CallConstructor(int arg_count) {
   function.ToRegister(rdi);
 
   // Constructors are called with the number of arguments in register
-  // eax for now. Another option would be to have separate construct
+  // rax for now. Another option would be to have separate construct
   // call trampolines per different arguments counts encountered.
   Result num_args = cgen()->allocator()->Allocate(rax);
   ASSERT(num_args.is_valid());