[CFE] Add --traceStepTiming to strong and weak suite

This option traces in which steps time is spent when running a suite.

On my machine for instance I get these results on a run ofstrong and
weak suites:

$ out/ReleaseX64/dart --enable-asserts pkg/front_end/test/fasta/strong_suite.dart -DsemiFuzz=true --traceStepTiming
Running suite strong...
[ 02:58 | 100.0% | +  571 | -    0 ]: strong/value_class/value_mixin_error

             check errors: 0:00:00.156828 ms
stress constant evaluator: 0:00:00.269382 ms
                    print: 0:00:00.439196 ms
                typeCheck: 0:00:02.575744 ms
       match expectations: 0:00:04.869435 ms
                   verify: 0:00:04.951524 ms
                  compile: 0:00:18.307246 ms
      transform component: 0:00:22.121665 ms
                 semifuzz: 0:00:59.717862 ms
              write .dill: 0:01:05.066461 ms
                      run: 0:01:15.028423 ms

$ out/ReleaseX64/dart --enable-asserts pkg/front_end/test/fasta/weak_suite.dart -DsemiFuzz=true --traceStepTiming
Running suite weak...
[ 10:11 | 100.0% | + 2225 | -    0 ]: weak/variance/unconstrained_inference

             check errors: 0:00:00.506722 ms
stress constant evaluator: 0:00:00.759073 ms
                    print: 0:00:01.293962 ms
                typeCheck: 0:00:09.974299 ms
       match expectations: 0:00:16.386842 ms
                   verify: 0:00:17.585821 ms
                  compile: 0:01:01.966016 ms
      transform component: 0:01:23.560216 ms
                 semifuzz: 0:02:50.969460 ms
              write .dill: 0:04:08.087519 ms
                      run: 0:05:17.911549 ms

In both cases writing dill and running takes quite a while, and
interesting writing the dill is almost as slow as running it.

Change-Id: Ie528e8f7e8a493e17e40a7235b456cc75381ca61
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/242874
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
8 files changed
tree: e890d4e3465aeff802214a7903be3cfde7f9013a
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. samples-dev/
  10. samples_2/
  11. sdk/
  12. tests/
  13. third_party/
  14. tools/
  15. utils/
  16. .clang-format
  17. .gitattributes
  18. .gitconfig
  19. .gitignore
  20. .gn
  21. .mailmap
  22. .style.yapf
  23. .vpython
  24. AUTHORS
  25. BUILD.gn
  26. CHANGELOG.md
  27. codereview.settings
  28. CONTRIBUTING.md
  29. DEPS
  30. LICENSE
  31. OWNERS
  32. PATENT_GRANT
  33. PRESUBMIT.py
  34. README.dart-sdk
  35. README.md
  36. sdk_args.gni
  37. SECURITY.md
  38. WATCHLISTS
README.md

Dart

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