now that DeclAttributes is a single word, there is no reason to deal with

it indirectly through another pointer from Decl, just embed DeclAttributes
directly into Decl and get rid of the "getMutableAttrs" nonsense.



Swift SVN r20216

lib/Serialization/ModuleFile.cpp

@@ -979,7 +979,7 @@ void ModuleFile::getImportDecls(SmallVectorImpl<Decl *> &Results) {
       auto *ID = ImportDecl::create(Ctx, FileContext, SourceLoc(), Kind,
                                     SourceLoc(), AccessPath);
       if (Dep.isExported())
-        ID->getMutableAttrs().add(
+        ID->getAttrs().add(
             new (Ctx) ExportedAttr(/*IsImplicit=*/false));
       ImportDecls.push_back(ID);
     }