[PATCH] Implement function type checker for the undefined behavior sanitizer.

[Peter Collingbourne]

Hi rsmith,

This uses function prefix data (D1191, not landed yet) to store
function type information at the function pointer.

http://llvm-reviews.chandlerc.com/D1338

Files:
  docs/UsersManual.rst
  include/clang/Basic/Sanitizers.def
  lib/CodeGen/CGBuiltin.cpp
  lib/CodeGen/CGCUDARuntime.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGExprCXX.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/TargetInfo.cpp
  lib/CodeGen/TargetInfo.h
  test/CodeGenCXX/catch-undef-behavior.cpp
  test/Driver/fsanitize.c
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