[clang] [llvm] [HLSL] Add `Increment`/`DecrementCounter` methods to structured buffers (PR #114148)

[Tex Riddell via cfe-commits]

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@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -emit-llvm-only -disable-llvm-passes -verify
+
+using handle_t = __hlsl_resource_t [[hlsl::resource_class(UAV)]] [[hlsl::contained_type(int)]];
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tex3d wrote:

Should we be ensuring the resource attributes are compatible with the operation?  This should be a `RWStructuredBuffer` only: UAV, raw and with contained_type.  Like diagnostics for each of the `bad_handle_*` cases below:
```suggestion
// RWStructuredBuffer<int>
using handle_t = __hlsl_resource_t [[hlsl::resource_class(UAV)]] [[hlsl::contained_type(int)]] [[hlsl::raw_buffer]];
// RWBuffer<int>
using bad_handle_not_raw_t = __hlsl_resource_t [[hlsl::resource_class(UAV)]] [[hlsl::contained_type(int)]];
// RWByteAddressBuffer
using bad_handle_no_type_t = __hlsl_resource_t [[hlsl::resource_class(UAV)]] [[hlsl::raw_buffer]];
// StructuredBuffer
using bad_handle_not_uav_t = __hlsl_resource_t [[hlsl::resource_class(SRV)]] [[hlsl::contained_type(int)]] [[hlsl::raw_buffer]];
```

https://github.com/llvm/llvm-project/pull/114148