Jordan Rose d8d18d3e0b [SerializeDoc] Don't crash in module-merging with a group info file (#27867) ...

Group info works by matching source filenames with groups, but in
module merging the decls in the module no longer have associated
SourceFiles. Long-term, maybe we should switch this to working on
filenames directly (using the new support provided by swiftsourceinfo
files), but for now just don't crash.

rdar://problem/56592085

2019-10-24 15:52:25 -07:00

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