[PATCH] Allow ExternalSemaSource to participate in typo correction

[Luke Zarko]

Ack, missed a 'virtual' in ExternalSemaSource.h when I split this off
from a larger changelist. Attached is the updated patch.

On Tue, Jul 9, 2013 at 4:33 PM, Luke Zarko <zarko at google.com> wrote:
> This patch allows ExternalSemaSource to participate in typo
> correction. This is useful for providing functionality that performs
> open-ended searches for missing identifiers. For example, an
> ExternalSemaSource can be defined that scans a ctags files; if it
> encounters an identifier in a header file (of the correct LookupKind),
> it can produce a diagnostic that suggests the inclusion of that
> header.
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