Mike Fricker 6197a82c6e Minor dependency performance improvements to UnrealBuildTool ...

- Faster include dependency caching (ToLowerInvariant() is faster than StringComparer.InvariantCultureIgnoreCase on all platforms)
- Cached off the list of FileInfos when requesting cached include dependencies (reduces string hash lookup spam)
- Moved an object lookup out of an inner loop

[CL 2399988 by Mike Fricker in Main branch]

2015-01-07 13:18:51 -05:00

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