[PATCH] Improve error message when a stale PCH dependency is encountered

[Ben Langmuir]

On Jan 16, 2014, at 10:15 AM, Argyrios Kyrtzidis <kyrtzidis at apple.com> wrote:
> 
> Very nice! I like the import stack in the notes.
> Could you also add a note saying something like "please rebuild the precompiled header ’foo.h.pch’” ?

Done.  I emitted it conditionally upon Diags.isDiagnosticsInFlight().  I wasn’t sure if that’s desired, but it seems to be the way the other notes are being emitted in this file so I did it too.

Ben

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