[llvm-commits] [Patch] Teach SimplifySetCC that comparing AssertZext i1 against 1 can be rewritten as a compare against 0

[Craig Topper]

This patch teachs SimplifySetCC that an AssertZext from i1 compared against
1 can be rewritten to compare against 0 with the opposite condition. This
allows X86 to use test %al, %al instead of cmp $1, %al. In particular, when
branching on the result of a function that returns a bool as seen in the
included test case.

-- 
~Craig
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