[PATCH] D33493: Speed up preamble loading

[Ivan Donchevskii via Phabricator via cfe-commits]

yvvan added a comment.

In https://reviews.llvm.org/D33493#774264, @arphaman wrote:

> Can you use a local map in `TranslateStoredDiagnostics` instead of storing one in the `ASTUnit`, or do you need to keep it around?


The whole purpose is to use it between different TranslateStoredDiagnostics calls because it scans the same files every time. And this cache allows it to reuse the source location.


https://reviews.llvm.org/D33493