[CGP] match a special-case of unsigned subtract overflow
This is the 'sub0' (negate) pattern from PR31754: https://bugs.llvm.org/show_bug.cgi?id=31754 llvm-svn: 354519
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This is the 'sub0' (negate) pattern from PR31754: https://bugs.llvm.org/show_bug.cgi?id=31754 llvm-svn: 354519