[clang] [llvm] [Clang][AArch64] Implement widening FMMLA intrinsics (PR #165282)

[Amina Chabane via llvm-commits]

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Amichaxx wrote:

hmm I did try this and couldn't get it to work, as you can see:
`Intrinsic name not mangled correctly for type arguments! Should be: llvm.aarch64.sve.fp8.fmmla.nxv4f32`

https://github.com/llvm/llvm-project/pull/165282