[SPIR-V] Honor inline spir-v attributes on functions#8616
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The [[vk::ext_decorate]], [[vk::ext_capability]], and [[vk::ext_extension]] attributes were only applied to variables, parameters, stage variables, entry-point functions, and functions carrying [[vk::ext_instruction]]. A plain function that carried them was skipped, so the attributes were silently dropped: no OpDecorate was emitted for its OpFunction, and no OpCapability / OpExtension was added to the module. Apply them when the function is registered (getOrRegisterFn), next to the existing linkage decoration. This reuses the same helpers as the variable and parameter paths: - the decoration goes through a new SpirvFunction overload of decorateWithIntrinsicAttrs, and - the capability/extension loops are factored into registerCapabilitiesAndExtensionsForDecl, now shared with the variable path. Only the literal form of ext_decorate is supported on functions; the id and string variants have no SpirvFunction-target decoration and are now diagnosed rather than silently dropped.
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The [[vk::ext_decorate]], [[vk::ext_capability]], and [[vk::ext_extension]] attributes were only applied to variables, parameters, stage variables, entry-point functions, and functions carrying [[vk::ext_instruction]]. A plain function that carried them was skipped, so the attributes were silently dropped: no OpDecorate was emitted for its OpFunction, and no OpCapability / OpExtension was added to the module.
Apply them when the function is registered (getOrRegisterFn), next to the existing linkage decoration. This reuses the same helpers as the variable and parameter paths:
Only the literal form of ext_decorate is supported on functions; the id and string variants have no SpirvFunction-target decoration and are now diagnosed rather than silently dropped.