[PATCH] Implement bad cast checks using control flow integrity information.

[Peter Collingbourne]

Hi kcc, jfb,

This scheme checks that pointer and lvalue casts are made to an object of
the correct dynamic type; that is, the dynamic type of the object must be
a derived class of the pointee type of the cast. The checks are currently
only introduced where the class being casted to is a polymorphic class.

http://reviews.llvm.org/D8312

Files:
  docs/ControlFlowIntegrity.rst
  docs/UsersManual.rst
  include/clang/Basic/Sanitizers.def
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/Driver/SanitizerArgs.cpp
  test/CodeGenCXX/cfi-cast.cpp
  test/Driver/fsanitize.c

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