[llvm] [AMDGPU] Make readonly noilas kernel arguments constant memory (PR #139629)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,40 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -global-isel -mtriple=amdgcn -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s
----------------
arsenm wrote:

```suggestion
; RUN: llc -global-isel -mtriple=amdgcn -stop-after=irtranslator %s -o - | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/139629