[PATCH v2 5/9] Start adding the infrastructure for handling TypoExprs.

[Kaelyn Takata]

The the typo count is propagated up the stack of
ExpressionEvaluationContextRecords when one is popped off of to
avoid accidentally dropping TypoExprs on the floor. For example,
the attempted correction of g() in test/CXX/class/class.mem/p5-0x.cpp
happens with an ExpressionEvaluationContextRecord that is popped off
the stack prior to ActOnFinishFullExpr being called and the tree
transform for TypoExprs being run.
---
 include/clang/Sema/Sema.h         |  25 ++++
 include/clang/Sema/SemaInternal.h |   5 +-
 lib/Sema/SemaExpr.cpp             |   7 +
 lib/Sema/SemaExprCXX.cpp          |  77 ++++++++++
 lib/Sema/SemaLookup.cpp           | 291 ++++++++++++++++++++++++--------------
 5 files changed, 299 insertions(+), 106 deletions(-)

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