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Added inst combine transforms for single bit tests from Chris's note

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Added inst combine transforms for single bit tests from Chris's note

if ((x & C) == 0) x |= C becomes x |= C
if ((x & C) != 0) x ^= C becomes x &= ~C
if ((x & C) == 0) x ^= C becomes x |= C
if ((x & C) != 0) x &= ~C becomes x &= ~C
if ((x & C) == 0) x &= ~C becomes nothing

Z3 Verifications code for above transform
http://rise4fun.com/Z3/Pmsh

Differential Revision: http://reviews.llvm.org/D3717

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