[PATCH] [GC] CodeGenPrep transform: simplify offsetable relocate

[Ramkumar Ramachandra]

Hi reames, sanjoy,

The transform is somewhat involved, but the basic idea is simple: find
derived pointers that have been offset from the base pointer using gep
and replace the relocate of the derived pointer with a gep to the
relocated base pointer (with the same offset).

http://reviews.llvm.org/D6883

Files:
  lib/CodeGen/CodeGenPrepare.cpp
  test/Transforms/CodeGenPrepare/statepoint-relocate.ll

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