[PATCH] Fix a mergefunc crash caused by bitcasting intrinsics

[Stepan Dyatkovskiy]

> It doesn't return true. 
But then, how FunctionComparator::enumerate could return "true" in this case?
Result of enumerate method is based on conditions "can-be-bitcasted" && "C1 == bitcast of C2". Have I missed something?

http://reviews.llvm.org/D3437

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