Avoid copying the file table while indexing #9493
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Copying the whole file table while indexing is quite expensive, and avoiding that would save us some time. We can minimally copy the
GlobalStateused by indexing threads, and populate their file table with a single entry for each file that they're processing.Motivation
Performance. Indexing happens a lot for package-directed type checking, and paying the cost of copying the file table every time is not acceptable.
Test plan
Existing tests.