[cfe-commits] PATCH: Add support for C++ namespace-aware typo correcting

[Kaelyn Uhrain]

This patch implements checking available C++ namespaces when trying to find
typo corrections for unknown identifiers.  There are currently 4 broken unit
tests (CXX/basic/basic.lookup/basic.lookup.argdep/p4.cpp,
CXX/class/class.local/p1.cpp, FixIt/typo.cpp, and
SemaObjC/synth-provisional-ivars.m) which I'm fairly sure are cases where
the tests need to be updated to reflect the new behavior instead of being
indicative of actual code breakage, but I'm not 100% certain.  The new unit
test, test/Sema/missing-namespace-qualifier-typo-corrections.cpp, is a good
demonstration of the improved suggestions provided by this patch as most of
the errors found by "clang -fsyntax-only" lack suggestions without this
patch..

Cheers,
Kaelyn
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