[PATCH] Don't constant fold bitcast/ptrtoint/inttoptr combinations without datalayout

[Matt Arsenault]

  Re-attach diff. I assume I missed one of the commits last time before I squashed them.

Hi eli.friedman,

http://llvm-reviews.chandlerc.com/D1157

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1157?vs=2963&id=3080#toc

Files:
  lib/IR/ConstantFold.cpp
  lib/IR/Instructions.cpp
  unittests/IR/InstructionsTest.cpp
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