r215145 - Flip the order the preprocessor and frontendaction are informed of the end of a file.

[Chandler Carruth]

On Thu, Aug 7, 2014 at 1:51 PM, Benjamin Kramer <benny.kra at googlemail.com>
wrote:

> Flip the order the preprocessor and frontendaction are informed of the end
> of a file.
>
> This allows using EndOfMainFile from a PPCallback to access data from the
> action. The pattern of PPCallback referencing an action is common in
> clang-tidy.
>

Do we have no use cases of th ereverse? Wondering if we should have
different APIs to support both directions.
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