x86: Move and slightly improve memset_erms
Implementation wise: 1. Remove the VZEROUPPER as memset_{impl}_unaligned_erms does not use the L(stosb) label that was previously defined. 2. Don't give the hotpath (fallthrough) to zero size. Code positioning wise: Move memset_{chk}_erms to its own file. Leaving it in between the memset_{impl}_unaligned both adds unnecessary complexity to the file and wastes space in a relatively hot cache section. (cherry picked from commit 4a3f29e7)
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