[AArch64][x86] add tests for add/sub signbits fold; NFC
As discussed/shown in D57401, we are missing a fold for subtract of 0/1 --> add 0/-1. llvm-svn: 352678
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As discussed/shown in D57401, we are missing a fold for subtract of 0/1 --> add 0/-1. llvm-svn: 352678