[PATCH 4/8] Have TypoCorrectionConsumer remember the last TypoCorrection returned.

[Kaelyn Takata]

Also ensure that all TypoCorrections have valid source ranges.
---
 include/clang/Sema/Sema.h         |  25 ++++
 include/clang/Sema/SemaInternal.h |   8 +-
 lib/Sema/SemaExpr.cpp             |   7 +
 lib/Sema/SemaExprCXX.cpp          |  78 ++++++++++
 lib/Sema/SemaLookup.cpp           | 294 ++++++++++++++++++++++++--------------
 5 files changed, 306 insertions(+), 106 deletions(-)

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