Package dart2js_info added a dependency on vm_snapshot_analysis.
Both packages are inside the Dart SDK source checkout.

The relative path to the new package must be added to
dependency_overrides in the pubspec.yaml.

Pre-launch Checklist

• [x ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• [x ] I read the [Tree Hygiene] wiki page, which explains my responsibilities.
• [x ] I read and followed the [Flutter Style Guide] and the [C++, Objective-C, Java style guides].
• I listed at least one issue that this PR fixes in the description above.
• I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt. See [testing the engine] for instructions on
  writing and running engine tests.
• I updated/added relevant documentation (doc comments with ///).
• [x ] I signed the [CLA].
• [x ] All existing and new tests are passing.