Make sure that the context argument of HAdd is never NULL.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 8e9fe00034964da47b342582dec75cea8cedc16a..ff363e461569983d1791ddc5ab9112f5620a5f3b 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -3567,7 +3567,8 @@ class BoundsCheckBbData: public ZoneObject {
        HConstant(new_offset, Representation::Integer32());
     if (*add == NULL) {
       new_constant->InsertBefore(check);
-      *add = new(BasicBlock()->zone()) HAdd(NULL,
+      HValue* context = HBinaryOperation::cast(check->index())->context();

[Jakob Kummerow, 2012/10/09 13:49:22]

I'd appreciate a comment here why check->index() is always an HBinaryOperation;
it is not obvious.

+      *add = new(BasicBlock()->zone()) HAdd(context,
                                             original_value,
                                             new_constant);
       (*add)->AssumeRepresentation(representation);