[PATCH v4 7/8] Add a callback for recovering using a typo correction.

[Kaelyn Takata]

Also keep track of the stack of Exprs visited during the tree transform
so the callback can be passed the parent of the TypoExpr.
---
 include/clang/Sema/Sema.h           |  8 ++++++--
 include/clang/Sema/TypoCorrection.h |  8 ++++++++
 lib/Sema/SemaExprCXX.cpp            | 19 ++++++++++++-------
 lib/Sema/SemaLookup.cpp             | 12 +++++++-----
 4 files changed, 33 insertions(+), 14 deletions(-)

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