[llvm-lit]

When executing not --crash env without any arguments,
it fails with exit code 127 because env reuires a
subcommand. This path addresses the issue by encoding
the command to properly return environment variables
even when no arguments are provided.

Author: Harini0924

llvm/utils/lit/lit/TestRunner.py

@@ -743,7 +743,8 @@ def _executeShCmd(cmd, shenv, results, timeoutHelper):
                     cmd_shenv = ShellEnvironment(shenv.cwd, shenv.env)
                 args = updateEnv(cmd_shenv, args)
                 if not args:
-                    raise InternalShellError(j, "Error: 'env' requires a" " subcommand")
+                    # Return the environment variables if no argument is provided 
+                    return {key: value for key, value in cmd_shenv.env.items()}
             elif args[0] == "not":
                 not_args.append(args.pop(0))
                 not_count += 1