[PATCH] [ASan/Win] Use clang rather than clang-cl by default for lit tests. Make Windows-only tests explicitly use clang-cl.

[Alexey Samsonov]

LGTM

================
Comment at: lib/sanitizer_common/tests/CMakeLists.txt:60
@@ -58,3 +59,3 @@
   list(APPEND SANITIZER_TEST_CFLAGS_COMMON
-       /fallback
+       -DGTEST_HAS_SEH=0
        -D_HAS_EXCEPTIONS=0)
----------------
GTEST_HAS_SEH=0 now comes from OMPILER_RT_GTEST_CFLAGS, doesn't it?

http://reviews.llvm.org/D3893