[llvm-branch-commits] [compiler-rt] release/19.x: [AArch64][SME] Rewrite __arm_get_current_vg to preserve required registers (#100143) (PR #100546)

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@kmclaughlin-arm (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix.  When you are done, please add the release:note label to this PR. 

https://github.com/llvm/llvm-project/pull/100546