[PATCH] X86ISelLowering has seemingly redundant code, remove it

[David Majnemer]

X86ISelLowering has support to treat:
(icmp ne (and (xor %flags, -1), (shl 1, flag)), 0)

as if it were actually:
(icmp eq (and %flags, (shl 1, flag)), 0)

However, r179386 has code at the InstCombine level to handle this.
This makes me believe that we can remove this target specific optimization.

-- 
David Majnemer
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