[PATCH] Fix a mergefunc crash caused by bitcasting intrinsics

[Björn Steinbrink]

Hi Stepan,

thanks, I had completely forgot to update the patch before asking for another review. I removed the changes to mergefunc itself and only kept test, which passes just fine. And while I didn't get to test it myself yet, according to a rust developer, rustc also compiles with the mergefunc pass enabled (that this failed was the original reason for the patch).

No, I do not have write access.

Thanks
Björn

http://reviews.llvm.org/D3437