make IRBuilder zap "X|0" and "X&-1" when building IR, this happens
during bitfield codegen and slows down -O0 compile times by making useless IR. rdar://7362516 llvm-svn: 86006
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during bitfield codegen and slows down -O0 compile times by making useless IR. rdar://7362516 llvm-svn: 86006