[llvm] [AArch64] Add an AArch64 pass for loop idiom transformations (PR #72273)

[Sjoerd Meijer via llvm-commits]

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+//===- AArch64LoopIdiomTransform.cpp - Loop idiom recognition -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
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sjoerdmeijer wrote:

Some high level descriptions what patterns are recognised would be nice.

https://github.com/llvm/llvm-project/pull/72273