[Backport staging-25.05] llvmPackages_{20,21,git}.compiler-rt: no fmv on aarch64 without libc#442664
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alyssais merged 1 commit intostaging-25.05from Sep 13, 2025
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aarch64 FMV (Function MultiVersioning) is not available before the libc is available. This causes issues while building with compiler-rt on aarch64. By disabling FMV before the libc is available resolves missing symbol errors. (cherry picked from commit ded560c)
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lovek323,
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sternenseemann
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Bot-based backport to
staging-25.05, triggered by a label in #409265.