[llvm] [libcxxabi] [libcxx] [clang-tools-extra] [libunwind] [compiler-rt] [lld] [libc] [clang] [flang] [lldb] [PowerPC] Combine sub within setcc back to sext (PR #66978)

[Kai Luo via cfe-commits]

bzEq wrote:

Please provide more description in PR summary.

https://github.com/llvm/llvm-project/pull/66978
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