[PATCH] Added InstCombine Tranformation for (A | B) ^ ((A ^ C) & B) -> (A ^ (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/D5061