[PATCH] Implement CFI type checks for non-virtual calls.

[Peter Collingbourne]

Hi kcc, jfb,

This uses the same class metadata currently used for virtual call and
cast checks.

The new flag is -fsanitize=cfi-nvcall. For consistency, the -fsanitize=cfi-vptr
flag has been renamed -fsanitize=cfi-vcall.

http://reviews.llvm.org/D8756

Files:
  docs/ControlFlowIntegrity.rst
  docs/UsersManual.rst
  include/clang/Basic/Sanitizers.def
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CGExprCXX.cpp
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/Driver/SanitizerArgs.cpp
  test/CodeGenCXX/cfi-nvcall.cpp
  test/CodeGenCXX/cfi-vcall.cpp
  test/CodeGenCXX/cfi-vptr.cpp
  test/Driver/fsanitize.c

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