[cxx-interop] Re-enable round tripping for debug types.

Author: zoecarver

lib/IRGen/IRGenDebugInfo.cpp

@@ -912,9 +912,7 @@ class IRGenDebugInfoImpl : public IRGenDebugInfo {
     Mangle::ASTMangler Mangler;
     std::string Result = Mangler.mangleTypeForDebugger(Ty, Sig);
 
-    // TODO(https://github.com/apple/swift/issues/57699): We currently cannot round trip some C++ types.
-    if (!Opts.DisableRoundTripDebugTypes &&
-        !Ty->getASTContext().LangOpts.EnableCXXInterop) {
+    if (!Opts.DisableRoundTripDebugTypes) {
       // Make sure we can reconstruct mangled types for the debugger.
       auto &Ctx = Ty->getASTContext();
       Type Reconstructed = Demangle::getTypeForMangling(Ctx, Result);