[llvm] [AMDGPU] Account for aliasing reads in RewriteOutArguments (PR #209908)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 138537 tests passed
* 3551 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/AMDGPU/rewrite-out-arguments-2.ll</summary>

```
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\opt.exe -S -mtriple=amdgcn-amd-amdhsa -amdgpu-rewrite-out-arguments < C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\rewrite-out-arguments-2.ll | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\rewrite-out-arguments-2.ll
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -S -mtriple=amdgcn-amd-amdhsa -amdgpu-rewrite-out-arguments
# .---command stderr------------
# | c:\_work\llvm-project\llvm-project\build\bin\opt.exe: <stdin>:39:22: error: use of undefined value '@callee'
# |   %result = call i32 @callee(ptr addrspace(5) %slot,
# |                      ^
# `-----------------------------
# error: command failed with exit status: 1
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\rewrite-out-arguments-2.ll'
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AMDGPU\rewrite-out-arguments-2.ll
# `-----------------------------
# error: command failed with exit status: 2

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/209908