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

[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/D4828