[PATCH] Added InstCombine Transformation for (A|B)^((A^C)|B) --> (~B)C

[Anton Korobeynikov]

Please provide the information asked in other thread for similar pattern:
1. How often this transformation triggers in LLVM testsuite. Where, in which tests.
2. How often this transformation triggers in SPEC. Where, in which tests.

http://reviews.llvm.org/D4970