[PATCH] Added InstCombine transform for pattern " ( ( A ^ B ) ^ ( ( ~A ) | B ) -> ( A | ( ~ B ) ) ".

[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/D5001