[AMDGPU] Introduce `AMDGPUSubtargetFeature` multiclass to reduce boilerplate (#176981) Many `SubtargetFeature` definitions in `AMDGPU.td` follow a repetitive pattern where a `FeatureXYZ` is paired with a `HasXYZ` predicate. This creates significant code duplication. This PR introduces `AMDGPUSubtargetFeature` multiclass that generates both the `SubtargetFeature` and its corresponding `Predicate` from a single definition. The multiclass accepts an optional `GenPredicate` parameter (default 1) to skip predicate generation when not needed. Not converted: - Features with dependencies - multiclass doesn't support this yet. Will do it in a follow-up. - Features with irregular predicates (e.g., Predicate without `AssemblerPredicate`, negated `Predicate`, complex multi-feature conditions). For those without `AssemblerPredicate`, this can be done by adding an extra optional argument to indicate whether `AssemblerPredicate` is needed. Will be done in a follow-up. - Features where field name doesn't match the `HasXYZ` pattern. 148 features converted, saving ~529 lines of code.
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