Fix overzealous casting that erroneously lead to ASSERTs

R=verwaest@chromium.org

Review URL: https://chromiumcodereview.appspot.com/21372002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15991 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.cc

@@ -7729,7 +7729,7 @@ HInstruction* HOptimizedGraphBuilder::BuildBinaryOperation(
       break;
     case Token::BIT_XOR:
     case Token::BIT_AND:
-      instr = New<HBitwise>(expr->op(), left, right);
+      instr = NewUncasted<HBitwise>(expr->op(), left, right);
       break;
     case Token::BIT_OR: {
       HValue* operand, *shift_amount;
@@ -7738,7 +7738,7 @@ HInstruction* HOptimizedGraphBuilder::BuildBinaryOperation(
           MatchRotateRight(left, right, &operand, &shift_amount)) {
         instr = new(zone()) HRor(context, operand, shift_amount);
       } else {
-        instr = New<HBitwise>(expr->op(), left, right);
+        instr = NewUncasted<HBitwise>(expr->op(), left, right);
       }
       break;
     }