Revert "Auto merge of #130766 - clarfonthey:stable-coverage-attribute, r=wesleywiser"

This reverts commit 1d35638dc3, reversing
changes made to f23a80a4c2.

compiler/rustc_feature/src/unstable.rs

@@ -447,6 +447,9 @@ declare_features! (
     (unstable, coroutine_clone, "1.65.0", Some(95360)),
     /// Allows defining coroutines.
     (unstable, coroutines, "1.21.0", Some(43122)),
+    /// Allows function attribute `#[coverage(on/off)]`, to control coverage
+    /// instrumentation of that function.
+    (unstable, coverage_attribute, "1.74.0", Some(84605)),
     /// Allows non-builtin attributes in inner attribute position.
     (unstable, custom_inner_attributes, "1.30.0", Some(54726)),
     /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.