[PATCH] Fix a mergefunc crash caused by bitcasting intrinsics

[Stepan Dyatkovskiy]

Its good to me! Sean, what do you think?

Thanks for working on it!

P.S.: Please ensure next buildbot will stay green after your commit:
http://lab.llvm.org:8011/builders/clang-mergefunc-x86_64-freeBSD9.2

BRANCH
  mergefunc

http://reviews.llvm.org/D3437

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