[4.2][BatchMode] Add -driver-batch-count to allow overriding batch count inferred by -j #17452
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graydon
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@swift-ci please test |
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This is just a cherry-pick of a change I landed last week in master, that lets us override the -j based batch count explicitly. It's proven useful while testing and diagnosing perf issues and I figured it'd be nice to have in the field when 4.2 ships. Nothing urgent though.