[PATCH] Allow ExternalSemaSource to participate in typo correction

[Luke Zarko]

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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