Steven Wu 9967e58624 [DependencyScanner] Use mutex to protect all accesses to contextCacheMap ...

Rather than only protecting the insertion and non-const access to
`ContextSpecificCacheMap` in ScanningService, extend the mutex
protection to all accesses. Even a 'const' lookup in the cache map is
not thread safe because the `StringMap` could be in the process of being
rehashed.

rdar://127205953

2024-07-31 13:17:04 -07:00

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