[tools][system-analyzer] Speed up log parsing
Reduce the dispatching overhead in the hottest loop when parsing log-lines. - Using a JSMap we can avoid internalizing strings - Preprocess the dispatch table and only have varArgs or functions as parsers - string[] seems to be slightly faster than string.charAt() Bug: v8:10644 Change-Id: I03b13bdeecda1ad037191ff74e05142ceeb6533c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3571890Reviewed-by:Patrick Thier <pthier@chromium.org> Commit-Queue: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/main@{#79816}
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