Add attributes.codegen.naked.target_feature

naked cannot be used with target_feature.
https://github.com/rust-lang/rust/blob/aae43c4532690153af7465227816c93036bb1604/compiler/rustc_passes/src/check_attr.rs#L672-L685

Author: ehuss

src/attributes/codegen.md

@@ -118,6 +118,11 @@ The [`track_caller`](#the-track_caller-attribute) attribute cannot be applied to
 r[attributes.codegen.naked.testing]
 The [testing attributes](testing.md) cannot be applied to a naked function.
 
+r[attributes.codegen.naked.target_feature]
+The [`target_feature`][attributes.codegen.target_feature] attribute cannot be applied to a naked function.
+
+<!-- TODO: Reflexive rules? -->
+
 r[attributes.codegen.no_builtins]
 ## The `no_builtins` attribute