[clang] [flang] [Flang][AArch64][VecLib] Add libmvec support for Flang/AArch64 (PR #146453)

[Benjamin Maxwell via cfe-commits]

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@@ -34,6 +34,7 @@ page](https://llvm.org/releases/).
 
 * -floop-interchange is now recognized by flang.
 * -floop-interchange is enabled by default at -O2 and above.
+* -fveclib=libmvec is supported for AArch64 (same as Flang/x86 and Clang/AArch64)
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MacDue wrote:

Is it worth noting the GLIBC 2.40 dependency here?

https://github.com/llvm/llvm-project/pull/146453