Backed out changeset a29d7f5ddde6 (bug 932982) for ggc asserts.
Backed out 6 changesets (bug 939614) for Hf timeouts on a CLOSED TREE.

Backed out changeset 50cc92857bf7 (bug 939614)
Backed out changeset 62a6568217da (bug 939614)
Backed out changeset 31d0d40d4a7c (bug 939614)
Backed out changeset 2b87186ddb6d (bug 939614)
Backed out changeset fa2005c9ca02 (bug 939614)
Backed out changeset 7d3c745a811f (bug 939614)