Whether to add the requirement \p Feature to the module \p M. This preserves backwards compatibility for two hacks in the Darwin system module map files: 1. The use of 'requires excluded' to make headers non-modular, which should really be mapped to 'textual' now that we have this feature. We drop the 'excluded' requirement, and set \p IsRequiresExcludedHack to true. Later, this bit will be us
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