Fix two bugs:

Fix two bugs:
 * The globals vector was getting broken and unsorted, this caused vortex
   to get badly pessimized
 * Node offset handling was being handled really poorly, and in particular
   we were not merging types with offsets right.  This causes several graphs
   to be non-merged.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4699 91177308-0d34-0410-b5e6-96231b3b80d8