[MC] Speed up checkFeatures() (NFCI) (#130936) checkFeatures() currently goes through ApplyFeatureFlag(), which will also handle implied features. This is very slow -- just querying every feature once takes up 10% of a Rust hello world compile. However, if we only want to query whether certain features are set/unset, we can do so directly -- implied features have already been handled when the FeatureBitset was constructed.
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