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Add `kl` and `widekl` target features, and the feature gate This is an effort towards #134813. This PR adds the target-features and the feature gate to `rustc` <!-- ```@rustbot``` label O-x86_64 O-x86_32 A-target-feature r? compiler -->
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.