[PATCH] Fix a mergefunc crash caused by bitcasting intrinsics

[Björn Steinbrink]

Stepan,
do you still want the test to be adjusted, given that the functions aren't actually merged? If so, I'd have to increase the size of both functions, for it to make any sense, because they're currently too small to be merged anyway. Doing so would be ok with me, but doesn't seem relevant to the bug at hand.

Regarding canLosslesslyBitCastTo, I would have checked for isIntrinsic() there. But yeah, let's keep to to mergefunc for now.

http://reviews.llvm.org/D3437

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