[clang] [HLSL] Implement TextureCube resource type (PR #218520)

[Helena Kotas via cfe-commits]

================
@@ -1970,8 +2028,12 @@ BuiltinTypeDeclBuilder::addSampleLevelMethods(ResourceDimension Dim,
       .returnValue(PH::LastStmt)
       .finalize();
 
+  // Cube textures do not support offsets.
+  if (Dim == ResourceDimension::Cube)
+    return *this;
----------------
hekota wrote:

```suggestion
  if (!hasResourceOffset(Dim))
    return *this;
```

https://github.com/llvm/llvm-project/pull/218520