Introduce number type information in the virtual frame.

src/x64/virtual-frame-x64.h

Index: src/x64/virtual-frame-x64.h
===================================================================
--- src/x64/virtual-frame-x64.h	(revision 3859)
+++ src/x64/virtual-frame-x64.h	(working copy)
@@ -28,6 +28,7 @@
 #ifndef V8_X64_VIRTUAL_FRAME_X64_H_
 #define V8_X64_VIRTUAL_FRAME_X64_H_
 
+#include "number-info.h"
 #include "register-allocator.h"
 #include "scopes.h"
 
@@ -81,7 +82,8 @@
   MacroAssembler* masm() { return cgen()->masm(); }
 
   // Create a duplicate of an existing valid frame element.
-  FrameElement CopyElementAt(int index);
+  FrameElement CopyElementAt(int index,
+    NumberInfo::Type info = NumberInfo::kUninitialized);
 
   // The number of elements on the virtual frame.
   int element_count() { return elements_.length(); }
@@ -380,16 +382,20 @@
 
   // Push an element on top of the expression stack and emit a
   // corresponding push instruction.
-  void EmitPush(Register reg);
-  void EmitPush(const Operand& operand);
-  void EmitPush(Heap::RootListIndex index);
-  void EmitPush(Immediate immediate);
+  void EmitPush(Register reg,
+                NumberInfo::Type info = NumberInfo::kUnknown);
+  void EmitPush(const Operand& operand,
+                NumberInfo::Type info = NumberInfo::kUnknown);
+  void EmitPush(Heap::RootListIndex index,
+                NumberInfo::Type info = NumberInfo::kUnknown);
+  void EmitPush(Immediate immediate,
+                NumberInfo::Type info = NumberInfo::kUnknown);
   void EmitPush(Smi* value);
   // Uses kScratchRegister, emits appropriate relocation info.
   void EmitPush(Handle<Object> value);
 
   // Push an element on the virtual frame.
-  void Push(Register reg);
+  void Push(Register reg, NumberInfo::Type info = NumberInfo::kUnknown);
   void Push(Handle<Object> value);
   void Push(Smi* value) { Push(Handle<Object>(value)); }
 
@@ -397,7 +403,7 @@
   // frame).
   void Push(Result* result) {
     if (result->is_register()) {
-      Push(result->reg());
+      Push(result->reg(), result->number_info());
     } else {
       ASSERT(result->is_constant());
       Push(result->handle());