[PATCH] D79834: Speed up preamble building by replacing the slow translateFile call by a new, faster isMainFile check

[Alex Lorenz via Phabricator via cfe-commits]

arphaman added a comment.

@jkorous it looks like dropping caching works too, this achieves similar perf results.


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  https://reviews.llvm.org/D79834/new/

https://reviews.llvm.org/D79834