[llvm] [clang] [AArch64] Add quadword gather load/scatter store intrinsics with unscaled vector offset (PR #71290)

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

LGTM Momchil! Thank you for the work.
I left a comments in the tests for gather and scatter. But it should not block the patch to be merged. I just think we have more tests than needed.

https://github.com/llvm/llvm-project/pull/71290