message: Update the multi-threaded pass timing to not assume that total time will be different from user time.
diff: // MT_LIST: Pass execution timing report
  // MT_LIST: Total Execution Time:
  -// MT_LIST: ---User Time--- ---Wall Time--- --- Name ---
  +// MT_LIST: Name
  // MT_LIST-DAG: Canonicalizer
  // MT_LIST-DAG: FunctionVerifier
  // MT_LIST-DAG: CSE
  // MT_PIPELINE: Pass execution timing report
  // MT_PIPELINE: Total Execution Time:
  -// MT_PIPELINE: ---User Time--- ---Wall Time--- --- Name ---
  +// MT_PIPELINE: Name
  // MT_PIPELINE-NEXT: Function Pipeline
  // MT_PIPELINE-NEXT: CSE
  // MT_PIPELINE-NEXT: (A) DominanceInfo
  