[llvm] [AArch64][nfc] Remove llvm/test/CodeGen/AArch64/README (PR #156881)

[Cullen Rhodes via llvm-commits]

https://github.com/c-rhodes created https://github.com/llvm/llvm-project/pull/156881

It was added (02650ac03632) to document SVE-related warnings in tests, but these were removed a while ago now (672f67300466).

>From 9daf1b4b849e9e1164c43d061e22fb3c7051f157 Mon Sep 17 00:00:00 2001
From: Cullen Rhodes <cullen.rhodes at arm.com>
Date: Thu, 4 Sep 2025 13:09:28 +0000
Subject: [PATCH] [AArch64][nfc] Remove llvm/test/CodeGen/AArch64/README

It was added in 02650ac03632 to document SVE-related warnings in tests,
but these were removed a while ago now (672f67300466).
---
 llvm/test/CodeGen/AArch64/README | 11 -----------
 1 file changed, 11 deletions(-)
 delete mode 100644 llvm/test/CodeGen/AArch64/README

diff --git a/llvm/test/CodeGen/AArch64/README b/llvm/test/CodeGen/AArch64/README
deleted file mode 100644
index b0a93e8668eeb..0000000000000
--- a/llvm/test/CodeGen/AArch64/README
+++ /dev/null
@@ -1,11 +0,0 @@
-++ SVE CodeGen Warnings ++
-
-When the WARN check lines fail in the SVE codegen tests it most likely means you
-have introduced a warning due to:
-1. Adding an invalid call to VectorType::getNumElements() or EVT::getVectorNumElements()
-   when the type is a scalable vector.
-2. Relying upon an implicit cast conversion from TypeSize to uint64_t.
-
-For generic code, please modify your code to work with ElementCount and TypeSize directly.
-For target-specific code that only deals with fixed-width vectors, use the fixed-size interfaces.
-Please refer to the code where those functions live for more details.