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

[Farzon Lotfi via llvm-commits]

farzonl wrote:

your new tests are failing

```
| error: line 2: Capability Linkage is not allowed by Vulkan 1.3 specification (or requires extension)
# |   OpCapability Linkage
# | 
# `-----------------------------
# error: command failed with exit status: 1

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
********************
Failed Tests (2):
  LLVM :: CodeGen/SPIRV/hlsl-intrinsics/group_memory_barrier.ll
  LLVM :: CodeGen/SPIRV/hlsl-intrinsics/group_memory_barrier_with_group_sync.ll
```

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