Fix/unify root handling in code generation.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 165c9ce6d20c95403483dee45d18a0881a6515fc..d537b0b2cbd953b36887fbf558ae9257e53faa7a 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -61,6 +61,15 @@ class MacroAssembler: public Assembler {
   // macro assembler.
   MacroAssembler(Isolate* isolate, void* buffer, int size);
 
+  // Operations on roots in the root-array.
+  void LoadRoot(Register destination, Heap::RootListIndex index);
+  void StoreRoot(Register source, Register scratch, Heap::RootListIndex index);
+  void CompareRoot(Register with, Register scratch, Heap::RootListIndex index);
+  // These methods can only be used with constant roots (i.e. non-writable
+  // and not in new space).
+  void CompareRoot(Register with, Heap::RootListIndex index);
+  void CompareRoot(const Operand& with, Heap::RootListIndex index);
+
   // ---------------------------------------------------------------------------
   // GC Support
   enum RememberedSetFinalAction {
@@ -362,10 +371,6 @@ class MacroAssembler: public Assembler {
   void SafeSet(Register dst, const Immediate& x);
   void SafePush(const Immediate& x);
 
-  // Compare against a known root, e.g. undefined, null, true, ...
-  void CompareRoot(Register with, Heap::RootListIndex index);
-  void CompareRoot(const Operand& with, Heap::RootListIndex index);
-
   // Compare object type for heap object.
   // Incoming register is heap_object and outgoing register is map.
   void CmpObjectType(Register heap_object, InstanceType type, Register map);