Slow performances when running tests with `--experimental-test-coverage`

### Version v22.9.0 ### Platform ```text Darwin N4V4PGFGPT 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:16:46 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T8112 arm64 ``` ### Subsystem _No response_ ### What steps will reproduce the bug? Run tests with `--experimental-test-coverage` option. Comparing it to other solutions (f.e. running Node tests and getting the coverage with `nyc`) this is way slower. For instance, on a repo with ~800 tests, collecting coverage with `nyc` takes 77s, while running with `--experimental-test-coverage` takes 148s. ### How often does it reproduce? Is there a required condition? I can reproduce it every time I run the Node tests with the native test coverage option. ### What is the expected behavior? Why is that the expected behavior? The performances should be at least equal (ideally better) than with 3rd party dependencies (like `nyc`). ### What do you see instead? An average time spent per test of 185ms vs 96ms. ### Additional information I tried running with/without additional options (f.e. `--test-coverage-exclude`, `--test-coverage-include`, `--test-coverage-branches`, `--test-coverage-functions`, `--test-coverage-lines`) but it didn't help. The performance issue seems only to be related to the algorithm that's triggered by the `--experimental-test-coverage` option.