Parallel recompilation: fewer handle dereferences and tighter checks.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 47fd69d7ccc2c20140c5d181079eeec86257ebf2..a35d9a6d856655982f22c4aef77ba98968d04fb8 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -386,8 +386,6 @@ class HGraph: public ZoneObject {
   }
 
  private:
-  HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
-                         Handle<Object> value);
   HConstant* GetConstantInt32(SetOncePointer<HConstant>* pointer,
                               int32_t integer_value);
 
@@ -422,7 +420,7 @@ class HGraph: public ZoneObject {
   SetOncePointer<HConstant> constant_minus1_;
   SetOncePointer<HConstant> constant_true_;
   SetOncePointer<HConstant> constant_false_;
-  SetOncePointer<HConstant> constant_hole_;
+  SetOncePointer<HConstant> constant_the_hole_;
   SetOncePointer<HArgumentsObject> arguments_object_;
 
   SetOncePointer<HBasicBlock> osr_loop_entry_;