[AArch64][FMV] Support feature MOPS in Function Multi Versioning. (#78788)
The patch adds support for FEAT_MOPS (Memory Copy and Memory Set instructions) in Function Multi Versioning. The bits [19:16] of the system register ID_AA64ISAR2_EL1 indicate whether FEAT_MOPS is implemented in AArch64 state. This information is accessible via ELF hwcaps.
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