[llvm] [AArch64] Combine vector FNEG+FMA into `FNML[A|S]` (PR #167900)

[Gaëtan Bossu via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc -mtriple=aarch64 -mattr=+v9a,+sve2,+crypto,+bf16,+sm4,+i8mm,+sve2-bitperm,+sve2-sha3,+sve2-aes,+sve2-sm4 %s -o - | FileCheck %s --check-prefixes=CHECK
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gbossu wrote:

Maybe also add another RUN line for testing streaming SVE? (I think we have an CLI option that forces all functions to be streaming somewhere). 

https://github.com/llvm/llvm-project/pull/167900