[clang] [AArch64] Add getHostCPUFeatures to query for enabled features in cpu… (PR #97749)

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neildhickey wrote:

Thanks for the review comments @madhur13490 and @davemgreen I plan to improve getHostCPUFeatures for AArach64 as well, this is just the first phase to add the function call.

https://github.com/llvm/llvm-project/pull/97749