[clang] [Clang] Amend SME attributes with support for ZT0. (PR #77941)

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rsandifo-arm wrote:

LGTM from a spec point of view, although it might be worth having some tests that have different ZA state from ZT0.  (But maybe not, since the code to handle ZA and ZT0 is mostly orthogonal.)

I won't approve because of the growth in `FunctionProtoType` — someone more qualified than me should sign off on that.

https://github.com/llvm/llvm-project/pull/77941