SwiftDriver performance fixes for swift caching#1825

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cachemeifyoucan merged 3 commits intoswiftlang:mainfrom

cachemeifyoucan:eng/PR-swift-driver-perf-for-caching

Feb 28, 2025

Commits on Feb 27, 2025

[SwiftScan] Improve the bridging between `[String]` and `const char **`
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[Planning] Avoid batching compile job twice
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[Caching] Don't produce cache key for initial compile job in batch mode
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