[clang] [llvm] [Clang][AArch64] Command-line options for A-profile's Sign Return Address Hardening (PR #176171)

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

My local tests look good too. Both this PR and #176187 look good to me, with the only concern that changing where the function attributes are attached to the function might deserve its own follow-up PR. Thank you very much for all the fixes!

BTW considering the tests, in case anyone else stumbles upon a failure in `MultiSource/Benchmarks/Trimaran/netbench-url/netbench-url.test`, this seems to be the issue in the test itself, see #158628 for the details.

https://github.com/llvm/llvm-project/pull/176171