[clang] [compiler-rt] [llvm] [FMV][AArch64] Unify features memtag and memtag2. (PR #112511)

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Wilco1 wrote:

There also isn't any demand to make it work in EL1 - almost all software runs in user space and kernels typically already have their own mechanisms to support different ISA variants. So I wouldn't call it a limitation - it's a high-level feature for average users by design, not kernel developers.

https://github.com/llvm/llvm-project/pull/112511