Port getInterfaceType() patterns in libSema

lib/Serialization/Serialization.cpp

@@ -3264,8 +3264,8 @@ public:
     // request-ified this goes away.
     if (!fn->hasInterfaceType()) {
       assert(fn->isImplicit());
-      S.M->getASTContext().getLazyResolver()->resolveDeclSignature(
-          const_cast<AccessorDecl *>(fn));
+      // FIXME: Remove this one
+      (void)fn->getInterfaceType();
     }
 
     using namespace decls_block;