Ben Langmuir 75a7e43581 [Modules] Allow missing header before a missing requirement ...

And make the module unavailable without breaking any parent modules.

If there's a missing requirement after we've already seen a missing
header, still update the IsMissingRequiement bit correctly.  Also,
diagnose missing requirements before missing headers, since the
existence of the header is moot if there are missing requirements.

llvm-svn: 242055

2015-07-13 19:48:52 +00:00

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