[clang] [llvm] [ARM][AArch64] Introduce the Armv9.7-A architecture version (PR #163154)

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https://github.com/CarolineConcatto approved this pull request.

Thank you Jonathan, 
This patch is similar to the one that we had last year for armv9.6.

https://github.com/llvm/llvm-project/pull/163154