[PATCH] D90646: [clang] Add warning when `-include-pch` is passed multiple times

[Keith Smiley via Phabricator via cfe-commits]

keith added a comment.

Yea seems like a reasonable request, looking through the uses nothing immediately pops out as being not supporting multiple PCHs but I guess before I went down that path I'd want someone who knew the code better to agree on that


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  https://reviews.llvm.org/D90646/new/

https://reviews.llvm.org/D90646