ostannard added a comment.

There are a number of buildbot failures which look related to this, e.g.

- 
http://lab.llvm.org:8011/builders/clang-cmake-armv7-full/builds/6730/steps/ninja%20check%201/logs/FAIL%3A%20UBSan-AddressSanitizer-armhf%3A%3Adiv-zero.cpp
- 
http://lab.llvm.org:8011/builders/clang-cmake-armv7-full/builds/6730/steps/ninja%20check%201/logs/FAIL%3A%20UBSan-AddressSanitizer-armhf%3A%3Adiv-zero.cpp

I think that removing the float-divide-by-zero sanitizer from 
-fsanitize=undefined has also caused it to be marked as not supported, so it 
can't be enabled even explicitly.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D63793/new/

https://reviews.llvm.org/D63793



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