Add warn(unreachable_pub) to rustc_codegen_llvm.

compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs

@@ -22,10 +22,10 @@ use crate::llvm;
 
 pub(crate) mod ffi;
 pub(crate) mod map_data;
-pub mod mapgen;
+mod mapgen;
 
 /// A context object for maintaining all state needed by the coverageinfo module.
-pub struct CrateCoverageContext<'ll, 'tcx> {
+pub(crate) struct CrateCoverageContext<'ll, 'tcx> {
     /// Coverage data for each instrumented function identified by DefId.
     pub(crate) function_coverage_map:
         RefCell<FxIndexMap<Instance<'tcx>, FunctionCoverageCollector<'tcx>>>,
@@ -34,7 +34,7 @@ pub struct CrateCoverageContext<'ll, 'tcx> {
 }
 
 impl<'ll, 'tcx> CrateCoverageContext<'ll, 'tcx> {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         Self {
             function_coverage_map: Default::default(),
             pgo_func_name_var_map: Default::default(),
@@ -42,7 +42,7 @@ impl<'ll, 'tcx> CrateCoverageContext<'ll, 'tcx> {
         }
     }
 
-    pub fn take_function_coverage_map(
+    fn take_function_coverage_map(
         &self,
     ) -> FxIndexMap<Instance<'tcx>, FunctionCoverageCollector<'tcx>> {
         self.function_coverage_map.replace(FxIndexMap::default())