IRGen: Type reconstruction supports opaque result types now

Author: slavapestov

lib/IRGen/IRGenDebugInfo.cpp

@@ -798,9 +798,7 @@ class IRGenDebugInfoImpl : public IRGenDebugInfo {
     std::string Result = Mangler.mangleTypeForDebugger(
         Ty, nullptr);
 
-    if (!Opts.DisableRoundTripDebugTypes
-        // FIXME: implement type reconstruction for opaque types
-        && !Ty->hasOpaqueArchetype()) {
+    if (!Opts.DisableRoundTripDebugTypes) {
       // Make sure we can reconstruct mangled types for the debugger.
 #ifndef NDEBUG
       auto &Ctx = Ty->getASTContext();