Matt Morehouse c6f2142428 Reland "[DFSan] Handle fast16labels for all API functions."
Support fast16labels in `dfsan_has_label`, and print an error for all
other API functions.  For `dfsan_dump_labels` we return silently rather
than crashing since it is also called from the atexit handler where it
is undefined behavior to call exit() again.

Reviewed By: kcc

Differential Revision: https://reviews.llvm.org/D84215
2020-07-23 21:19:39 +00:00
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