coverage: -Zcoverage-options=branch is no longer a placeholder

compiler/rustc_session/src/config.rs

@@ -146,7 +146,7 @@ pub enum InstrumentCoverage {
 /// Individual flag values controlled by `-Z coverage-options`.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct CoverageOptions {
-    /// Add branch coverage instrumentation (placeholder flag; not yet implemented).
+    /// Add branch coverage instrumentation.
     pub branch: bool,
 }
 

src/doc/rustc/src/instrument-coverage.md

@@ -352,7 +352,7 @@ This unstable option provides finer control over some aspects of coverage
 instrumentation. Pass one or more of the following values, separated by commas.
 
 - `branch` or `no-branch`
-  - Placeholder for potential branch coverage support in the future.
+  - Enables or disables branch coverage instrumentation.
 
 ## Other references
 

src/doc/unstable-book/src/compiler-flags/coverage-options.md

@@ -5,4 +5,4 @@ This option controls details of the coverage instrumentation performed by
 
 Multiple options can be passed, separated by commas. Valid options are:
 
-- `branch` or `no-branch`: Placeholder for future branch coverage support.
+- `branch` or `no-branch`: Enables or disables branch coverage instrumentation.