Prefer doc comments over //-comments in compiler

Author: WaffleLapkin

src/context.rs

@@ -88,9 +88,9 @@ pub struct CodegenCx<'gcc, 'tcx> {
     pub vtables: RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), RValue<'gcc>>>,
 
     // TODO(antoyo): improve the SSA API to not require those.
-    // Mapping from function pointer type to indexes of on stack parameters.
+    /// Mapping from function pointer type to indexes of on stack parameters.
     pub on_stack_params: RefCell<FxHashMap<FunctionPtrType<'gcc>, FxHashSet<usize>>>,
-    // Mapping from function to indexes of on stack parameters.
+    /// Mapping from function to indexes of on stack parameters.
     pub on_stack_function_params: RefCell<FxHashMap<Function<'gcc>, FxHashSet<usize>>>,
 
     /// Cache of emitted const globals (value -> global)