[PATCH] Fix a mergefunc crash caused by bitcasting intrinsics

[Stepan Dyatkovskiy]

Björn,
I think the fix of canLosslesslyBitcasted could be only accepted in case, when functions are not bitcastable at all. But I think they are. At least you can define such bitcast in globals. So I think, we better do our best from MergeFunctions side, keep it stable, file a bug, so then we could work it afterwards.

http://reviews.llvm.org/D3437

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