[heap] User safer root set accessor when possible.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index dd624b9c1f0e4cb6e0ac3ecb14bea93cde2eac77..fb0cb33aaafdfcd03d8238d516284299163f7075 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -66,8 +66,7 @@ void MacroAssembler::Store(Register src, const Operand& dst, Representation r) {
 
 void MacroAssembler::LoadRoot(Register destination, Heap::RootListIndex index) {
   if (isolate()->heap()->RootCanBeTreatedAsConstant(index)) {
-    Handle<Object> value(&isolate()->heap()->roots_array_start()[index]);
-    mov(destination, value);
+    mov(destination, isolate()->heap()->root_handle(index));
     return;
   }
   ExternalReference roots_array_start =
@@ -105,16 +104,14 @@ void MacroAssembler::CompareRoot(Register with,
 
 void MacroAssembler::CompareRoot(Register with, Heap::RootListIndex index) {
   DCHECK(isolate()->heap()->RootCanBeTreatedAsConstant(index));
-  Handle<Object> value(&isolate()->heap()->roots_array_start()[index]);
-  cmp(with, value);
+  cmp(with, isolate()->heap()->root_handle(index));
 }
 
 
 void MacroAssembler::CompareRoot(const Operand& with,
                                  Heap::RootListIndex index) {
   DCHECK(isolate()->heap()->RootCanBeTreatedAsConstant(index));
-  Handle<Object> value(&isolate()->heap()->roots_array_start()[index]);
-  cmp(with, value);
+  cmp(with, isolate()->heap()->root_handle(index));
 }