message: NFC: Update the PassInstrumentation section.
  This section has grown stale as the pass infrastructure has been generalized.
diff: @@ -358,6 +358,12 @@ MLIR provides a customizable framework to instrument pass execution and analysis
  computation. This is provided via the `PassInstrumentation` class. This class
  provides hooks into the PassManager that observe various pass events:
  +* `runBeforePipeline`
  + * This callback is run just before a pass pipeline, i.e. pass manager, is
  + executed.
  +* `runAfterPipeline`
  + * This callback is run right after a pass pipeline has been executed,
  + successfully or not.
  * `runBeforePass`
  * This callback is run just before a pass is executed.
  * `runAfterPass`
  @@ -389,15 +395,16 @@ struct DominanceCounterInstrumentation : public PassInstrumentation {
  }
  };
  -PassManager pm;
  +MLIRContext *ctx = ...;
  +PassManager pm(ctx);
  // Add the instrumentation to the pass manager.
  unsigned domInfoCount;
  pm.addInstrumentation(
  std::make_unique<DominanceCounterInstrumentation>(domInfoCount));
  -// Run the pass manager on a module.
  -Module m = ...;
  +// Run the pass manager on a module operation.
  +ModuleOp m = ...;
  if (failed(pm.run(m)))
  ...
  