[HLSL] Add HLSLAttributedResourceType (#106181)

Introducing `HLSLAttributedResourceType` - a new type that is similar to
`AttributedType` but with additional data specific to HLSL resources.
`AttributeType` currently only stores an attribute kind and no
additional data from the type attribute parameters. This does not really
work for HLSL resources since its type attributes contain non-boolean
values that need to be retained as well.

For example:

```
template <typename T> class RWBuffer {
  __hlsl_resource_t  [[hlsl::resource_class(uav)]] [[hlsl::is_rov]] handle;
};
```

The data `HLSLAttributedResourceType` needs to eventually store are:
- resource class (SRV, UAV, CBuffer, Sampler)
- texture dimension(1-3)
- flags is_rov, is_array, is_feedback and is_multisample
- contained type

All of these values except contained type will be stored in
`HLSLAttributedResourceType::Attributes` struct and accessed
individually via the fields. There is also `Data` alias that covers all
of these values as a `unsigned` which is used for hashing and the AST
type serialization.

During type attribute processing all HLSL type attributes will be
validated and collected by SemaHLSL (by
`SemaHLSL::handleResourceTypeAttr`) and in the end combined into a
single `HLSLAttributedResourceType` instance (in
`SemaHLSL::ProcessResourceTypeAttributes`). `SemaHLSL` will also need to
short-term store the `TypeLoc` information for the new type that will be
grabbed by `TypeSpecLocFiller` soon after the type is created.

Part 1/2 of #104861

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index a574728..fae26d1 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -2493,6 +2493,7 @@ void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
     case Type::UnaryTransform:
     case Type::Attributed:
     case Type::BTFTagAttributed:
+    case Type::HLSLAttributedResource:
     case Type::SubstTemplateTypeParm:
     case Type::MacroQualified:
     case Type::CountAttributed: