[PATCH] Allow ExternalSemaSource to participate in typo correction

[Luke Zarko]

I've fixed some style nits and added some unit tests.

On Thu, Jul 11, 2013 at 10:45 AM, Luke Zarko <zarko at google.com> wrote:
> 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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