[PATCH] Teach InstCombine about pointer address spaces

[Bill Wendling]

  The change to "lib/Transforms/Utils/Local.cpp" isn't necessary for this patch. It should be applied separately.

  The change in "lib/Analysis/InstructionSimplify.cpp" at 2037 doesn't look like part of this patch. Is it? Could you explain why that's there?

  Otherwise, LGTM.

http://llvm-reviews.chandlerc.com/D1250