[llvm] [clang] [AMDGPU] Emit a waitcnt instruction after each memory instruction (PR #79236)

[Pierre van Houtryve via cfe-commits]

================
@@ -0,0 +1,362 @@
+; RUN: llc -mtriple=amdgcn -mcpu=gfx900 -mattr=+amdgpu-precise-memory-op < %s | FileCheck %s -check-prefixes=GFX9
+; RUN: llc -mtriple=amdgcn -mcpu=gfx90a -mattr=+amdgpu-precise-memory-op < %s | FileCheck %s -check-prefixes=GFX90A
+; RUN: llc -mtriple=amdgcn -mcpu=gfx1010 -mattr=+amdgpu-precise-memory-op < %s | FileCheck %s -check-prefixes=GFX10
+; RUN: llc -mtriple=amdgcn-- -mcpu=gfx900 -mattr=-flat-for-global,+enable-flat-scratch,+amdgpu-precise-memory-op -amdgpu-use-divergent-register-indexing < %s | FileCheck --check-prefixes=GFX9-FLATSCR %s
----------------
Pierre-vh wrote:

gfx11 and 12 tests

https://github.com/llvm/llvm-project/pull/79236