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

[Steven Perron via cfe-commits]

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s-perron wrote:

```suggestion
define void @test_group_memory_barrier_with_group_sync() #0 {
```

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