James Molloy 2018091e87 Properly check if a CMPZ node is in fact comparing against zero
This was left implicit and never ever checked, which means we could have a CMPZ against some non-zero value and we were carrying on with BFI conversion regardless.

Caught by Oliver Stannard using csmith; regression test added.

llvm-svn: 253195
2015-11-16 10:49:25 +00:00
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