[compiler] Spawn concurrent jobs for --stress-concurrent-inlining
.. to increase coverage of concurrent inlining, at least in this stress mode. The common pattern in mjsunit tests is to call `%OptimizeFunctionOnNextCall(f)` for interesting function `f`. This explicitly triggers non-concurrent compilation, significantly decreasing relevant coverage of concurrent inlining. This CL recovers coverage by spawning an additional concurrent compile job when 1. --stress-concurrent-inlining is enabled, and 2. the requested compile mode is non-concurrent. The result of these additional jobs is discarded. Drive-by: Fix two simple uncovered issues. Bug: v8:7790,v8:11513,v8:11648 Change-Id: If1e8ca5ba737e3cecdec9e15e4a86b28fe9fb2de Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2824440 Commit-Queue: Jakob Gruber <jgruber@chromium.org> Reviewed-by:Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#73967}
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