For PR1187:

For PR1187:
Some changes to get the smbd.ll test case working:
1. Move the logic for CSRETCC->sret attribute out of the ResolveDefinitions
   code and into getExistingValue. This resolves it much earlier and works
   in function scope as well.
2. Fix handling of CSRETCC->sret for the store instruction.
3. Rewrite the code for handling renaming to factor in linkage types.
4. Rename a structure filed for a PATypeInfo* so it doesn't get confused
   with a field for a Type*.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34043 91177308-0d34-0410-b5e6-96231b3b80d8