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The new `DECL_ATTR_FEATURE_REQUIREMENT` macro in DeclAttr.def can be used to declare that an attribute should only be available when a related language feature is enabled. Effects: • `#if hasAttribute(someAttr)` will return `false` unless the required feature is enabled. • Code completion will not include the attribute unless the required feature is enabled. • `TypeChecker::checkDeclAttributes()` diagnoses non-implicit uses of the attribute. Add this mechanism and use it to tie @abi to the ABIAttribute feature. Also design tests for it.