[lldb] Improve the wording of the error message if no type info is found

rdar://145099577
(cherry picked from commit d080aa9)

Author: adrian-prantl

lldb/source/Host/macosx/objcxx/Host.mm

@@ -1248,6 +1248,7 @@ typedef int (*posix_spawnattr_setarchpref_np_t)(
   const char *tmp_argv[2];
   char *const *argv = const_cast<char *const *>(
       launch_info.GetArguments().GetConstArgumentVector());
+
   Environment::Envp envp = launch_info.GetEnvironment().getEnvp();
   if (argv == NULL) {
     // posix_spawn gets very unhappy if it doesn't have at least the program

lldb/source/Plugins/LanguageRuntime/Swift/ReflectionContext.cpp

@@ -204,9 +204,10 @@ class TargetReflectionContext : public ReflectionContextInterface {
     auto type_info = m_reflection_ctx.getTypeInfo(&type_ref, provider);
     if (!type_info) {
       std::stringstream ss;
+      ss << "Could not find type info for ";
       type_ref.dump(ss);
-      return llvm::createStringError("Could not get type info for typeref: " +
-                                     ss.str());
+      ss << " in reflection metadata";
+      return llvm::createStringError(ss.str());
     }
 
     if (log && log->GetVerbose()) {