+ /// bits. This version does not change the implied bits.
+ FeatureBitset ToggleFeature(const FeatureBitset& FB);
+
+ /// ToggleFeature - Toggle a set of features and returns the re-computed
+ /// feature bits. This version will also change all implied bits.
+ FeatureBitset ToggleFeature(StringRef FS);
+
+ /// Apply a feature flag and return the re-computed feature bits, including
+ /// all feature bits implied by the flag.
+ FeatureBitset ApplyFeatureFlag(StringRef FS);