Add a createError variant without error code (NFC) (#93209)

For the significant amount of call sites that want to create an
incontrovertible error, such a wrapper function creates a significant
readability improvement and lowers the cost of entry to add error
handling in more places.

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp

@@ -2494,8 +2494,7 @@ bool ScriptInterpreterPythonImpl::LoadScriptingModule(
 
   auto ExtendSysPath = [&](std::string directory) -> llvm::Error {
     if (directory.empty()) {
-      return llvm::make_error<llvm::StringError>(
-          "invalid directory name", llvm::inconvertibleErrorCode());
+      return llvm::createStringError("invalid directory name");
     }
 
     replace_all(directory, "\\", "\\\\");
@@ -2508,10 +2507,8 @@ bool ScriptInterpreterPythonImpl::LoadScriptingModule(
                           directory.c_str(), directory.c_str());
     bool syspath_retval =
         ExecuteMultipleLines(command_stream.GetData(), exc_options).Success();
-    if (!syspath_retval) {
-      return llvm::make_error<llvm::StringError>(
-          "Python sys.path handling failed", llvm::inconvertibleErrorCode());
-    }
+    if (!syspath_retval)
+      return llvm::createStringError("Python sys.path handling failed");
 
     return llvm::Error::success();
   };