David Sherwood f4515ab858 Revert "[CodeGen][AArch64] Ensure isSExtCheaperThanZExt returns true for negative constants"
This reverts commit 197f3c0deb76951315118ef13937b67ea9cbd5aa.

Reverting after miscompilation errors discovered with ffmpeg.
2022-01-18 08:40:20 +00:00
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