[PATCH] UBSan: Enable runtime library tests on Windows, and get most tests passing.

[Peter Collingbourne]

Hi samsonov,

Specifically:

- Disable int128 tests on Windows, as MSVC cl.exe does not support
  int128, so we might not have been able to build the runtime
  with int128 support.

- XFAIL the vptr tests as we lack Microsoft ABI support.

- XFAIL enum.cpp as UBSan fails to add the correct instrumentation code
  for some reason.

- Modify certain tests that build executables multiple times to use
  unique names for each executable. This works around a race condition
  observed on Windows.

- Implement IsAccessibleMemoryRange for Windows to fix the last
  misaligned.cpp test.

- Introduce a substitution for testing crashes on Windows using
  KillTheDoctor.

http://reviews.llvm.org/D10864

Files:
  lib/sanitizer_common/sanitizer_win.cc
  test/ubsan/CMakeLists.txt
  test/ubsan/TestCases/Float/cast-overflow.cpp
  test/ubsan/TestCases/Integer/add-overflow.cpp
  test/ubsan/TestCases/Integer/div-zero.cpp
  test/ubsan/TestCases/Integer/incdec-overflow.cpp
  test/ubsan/TestCases/Integer/negate-overflow.cpp
  test/ubsan/TestCases/Integer/shift.cpp
  test/ubsan/TestCases/Integer/sub-overflow.cpp
  test/ubsan/TestCases/Integer/uadd-overflow.cpp
  test/ubsan/TestCases/Integer/uincdec-overflow.cpp
  test/ubsan/TestCases/Integer/usub-overflow.cpp
  test/ubsan/TestCases/Misc/bounds.cpp
  test/ubsan/TestCases/Misc/deduplication.cpp
  test/ubsan/TestCases/Misc/enum.cpp
  test/ubsan/TestCases/Misc/missing_return.cpp
  test/ubsan/TestCases/TypeCheck/misaligned.cpp
  test/ubsan/TestCases/TypeCheck/null.cpp
  test/ubsan/TestCases/TypeCheck/vptr-virtual-base.cpp
  test/ubsan/TestCases/TypeCheck/vptr.cpp
  test/ubsan/lit.common.cfg

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