Cristiano Carvalheiro a46491d0d3 cmLocalGenerator: Improve performance of source group lookups ...

Introduce an index from source file to source group in
`cmLocalGenerator` to make lookups significantly more efficient
during the source group generation, which could be particularly
slow when dealing with thousands of source files.
Falls back to the recursive lookup when the source file is not present
on the index, which is more likely to happen when dealing with
regex-based sources.

Fixes: #27359

2025-11-26 20:32:19 +00:00

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