[clang] [llvm] [HLSL][DXIL][SPRIV] Added `GroupMemoryBarrier()` (PR #185383)

[Steven Perron via cfe-commits]

================
@@ -0,0 +1,14 @@
+; RUN: llc -O0 -verify-machineinstrs -mtriple=spirv-unknown-vulkan %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-vulkan %s -o - -filetype=obj | spirv-val --target-env vulkan1.3 %}
+
+; CHECK: OpMemoryModel Logical GLSL450
+
+define void @test_group_memory_barrier() {
+entry:
+  ; CHECK: %[[#TY:]] = OpTypeInt 32 0
+  ; CHECK-DAG: %[[#MEM_SEM:]] = OpConstant %[[#TY]] 16
+  ; CHECK-DAG: %[[#EXEC_AND_MEM_SCOPE:]] = OpConstant %[[#TY]] 2
+  ; CHECK: OpMemoryBarrier %[[#EXEC_AND_MEM_SCOPE]] %[[#MEM_SEM]]
+  call void @llvm.spv.group.memory.barrier()
+  ret void
+}
----------------
s-perron wrote:

```suggestion
}

attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
```

https://github.com/llvm/llvm-project/pull/185383