Fix MSVC "not all control paths return a value" warning. NFC.

[HLSL] Make HLSLAttributedResourceType canonical and add code paths to convert HLSL types to DirectX target types (#110327)

Translates `RWBuffer` and `StructuredBuffer` resources buffer types to
Di

[HLSL] Make HLSLAttributedResourceType canonical and add code paths to convert HLSL types to DirectX target types (#110327)

Translates `RWBuffer` and `StructuredBuffer` resources buffer types to
DirectX target types `dx.TypedBuffer` and `dx.RawBuffer`.

Includes a change of `HLSLAttributesResourceType` from 'sugar' type to
full canonical type. This is required for codegen and other clang
infrastructure to work property on HLSL resource types.

Fixes #95952 (part 2/2)

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[DirectX] Add DirectXTargetCodeGenInfo (#104856)

Adds target codegen info class for DirectX. For now it always translates
`__hlsl_resource_t` handle to `target("dx.TypedBuffer", i32, 1, 0, 1)`
(`R

[DirectX] Add DirectXTargetCodeGenInfo (#104856)

Adds target codegen info class for DirectX. For now it always translates
`__hlsl_resource_t` handle to `target("dx.TypedBuffer", i32, 1, 0, 1)`
(`RWBuffer<int>`). More work is needed to determine the actual target
exp type and parameters based on the resource handle attributes.

Part 1/2 of #95952

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