Enhance Scudo test to tolerate GWP-Asan.
Enhance Scudo test to tolerate GWP-Asan.

When LLVM was updated to a new enough release to have GWP-Asan, we
started getting probabilistic test failures, as the double-free would
sometimes be caught by GWP-Asan (odds are about 1/5000).

We should tolerate either output.

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