[skip ci] Mention AVX(2) detection fix for MSVC in UPGRADING #16248
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This is likely more important than the possibility to build for AVX-512 since our official binaries have build time support for SSE2 only. So proper detection of AVX may make a huge performance difference for `base64_*()` and some MBString functionality.
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This is likely more important than the possibility to build for AVX-512 since our official binaries have build time support for SSE2 only. So proper detection of AVX may make a huge performance difference for
base64_*()and some MBString functionality.For reference: #15301