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7ae29d49ae
Adds a `-j`/`--workers-count` parameter to `tools/packaging/test262.py`, defaulting to `[number of cores] - 1`. Speeds up running the test suite by about ~3x on my 4-core machine, with the SpiderMonkey shell. This could certainly be optimized more by just appending test results to per-thread lists and merging them at the end, but it's better than nothing.