Add a lint for writing #[feature]
for stable features, warn by default...
#21958
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....
The 'stable_features' lint helps people progress from unstable to
stable Rust by telling them when they no longer need a
feature
attribute because upstream Rust has declared it stable.
This compares to the existing 'unstable_features' lint, which is used
to implement feature staging, and triggers on any use
of
#[feature]
.