message: [MLIR] Enable lit test driver for simple check test.
diff: -// RUN: %mlir-opt --help | grep 'MLIR modular optimizer'
  -// RUN: %mlir-opt --help | FileCheck %s
  +// TODO(andydavis) Resolve relative path issue w.r.t invoking mlir-opt in RUN
  +// statements (perhaps through using lit config substitutions).
  +//
  +// RUN: %S/../../mlir-opt --help | FileCheck %s
  //
  // CHECK: OVERVIEW: MLIR modular optimizer driver
  