[turbofan] Serialize source position table
... for concurrent graph building. This is a reland of jarin@chromium.org's CL https://chromium-review.googlesource.com/c/v8/v8/+/1682027 with support to access the source positions through a handle when running without concurrent inlining, because the positions may move due to GC allocation. Bug: v8:7790 Change-Id: I1b2cc84c8cb801cb82f1a527fce736c74c156c1d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1683726Reviewed-by: Georg Neis <neis@chromium.org> Reviewed-by: Maya Lekova <mslekova@chromium.org> Commit-Queue: Michael Stanton <mvstanton@chromium.org> Cr-Commit-Position: refs/heads/master@{#62593}
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