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[Clang][AArch64] Change SME attributes for shared/new/preserved state. (
#76971) This patch replaces the `__arm_new_za`, `__arm_shared_za` and `__arm_preserves_za` attributes in favour of: * `__arm_new("za")` * `__arm_in("za")` * `__arm_out("za")` * `__arm_inout("za")` * `__arm_preserves("za")` As described in ARM-software/acle#276. One change is that `__arm_in/out/inout/preserves(S)` are all mutually exclusive, whereas previously it was fine to write `__arm_shared_za __arm_preserves_za`. This case is now represented with `__arm_in("za")`. The current implementation uses the same LLVM attributes under the hood, since `__arm_in/out/inout` are all variations of "shared ZA", so can use the existing `aarch64_pstate_za_shared` attribute in LLVM. #77941 will add support for the new "zt0" state as introduced with SME2.
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