[clang] [llvm] [Clang][LLVM] Implement single-single vectors MOP4{A/S} (PR #127797)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -force-streaming -verify-machineinstrs < %s | FileCheck %s
+
+target triple = "aarch64-linux"
+
+; Widening
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CarolineConcatto wrote:

Just in case, maybe we can add some tests for the tile limits:
Don't need to be to all of them, but a
"Half-precision, single vectors" variants: is the name of the ZA tile ZA0-ZA1, encoded in the "ZAda" field.
"Single-precision, single vectors" variants: is the name of the ZA tile ZA0-ZA3, encoded in the "ZAda" field.
"Double-precision, single vectors" variants: is the name of the ZA tile ZA0-ZA7, encoded in the "ZAda" field.

https://github.com/llvm/llvm-project/pull/127797