[clang] [llvm] [HLSL] Implement Texture2D type and Sample method in Clang (PR #177240)

[Nathan Gauër via cfe-commits]

================
@@ -31,6 +31,14 @@ enum class ResourceClass : uint8_t {
   LastEntry = Sampler,
 };
 
+enum class ResourceDimension : uint8_t {
+  DimensionUnknown = 0,
+  Dimension1D,
+  Dimension2D,
+  Dimension3D,
+  DimensionCube,
+};
----------------
Keenuts wrote:

The SPIR-V side used `Dimension::Dim1D` so it's at least shorter

https://github.com/llvm/llvm-project/pull/177240