[Bug target/104610] memcmp () == 0 can be optimized better for avx512f

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104610
Bug 104610 depends on bug 104704, which changed state.

Bug 104704 Summary: [12 Regression] ix86_gen_scratch_sse_rtx doesn't work with 
explicit XMM7/XMM15/XMM31 usage
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104704

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED