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The ability to spell out and specify the resource class is necessary for testing various resource binding behaviors. Though it is not intended for users to use this in customized HLSL source code, the ability to specify the resource class via an attribute is immensely helpful for writing thorough tests. This PR introduces a new attribute, hlsl::resource_attribute, that can only be applied on structs. This attribute only has 1 required argument, and must be one of: ``` SRV UAV CBuffer Sampler ``` By applying this attribute to a struct, the struct will have the `HLSLResourceClassAttr` attribute attached to it in the AST representation, which provides information on the type of resource class the struct is meant to be. The resource class data that was originally contained within the `HLSLResourceAttr` attribute has been removed in favor of this new attribute, and so certain ast-dump tests need to be modified so that the same information can be represented via 2 attributes instead of one. Fixes #98193 --------- Co-authored-by: Damyan Pepper <damyanp@microsoft.com>