[PATCH] Fix a mergefunc crash caused by bitcasting intrinsics

[Stepan Dyatkovskiy]

So getBitCast create new Value (call it C3).
C3 is not equal to C1, but it still hangs in air.
Perhaps then just as another solution, we could do the next:
1. Check for bitcast possibility
2. Create bitcast (C3)
3. Check whether C1 is equal to C3
4. Get rid of C3.

http://reviews.llvm.org/D3437

REPLY HANDLER ACTIONS
  Reply to comment, or !reject, !abandon, !reclaim, !resign, !rethink, !unsubscribe.