[libFuzzer] Exclude a test failing on OS X.
# Test that we can find a stack overflow
+REQUIRES: linux
RUN: %cpp_compiler -fsanitize-coverage=stack-depth %S/DeepRecursionTest.cpp -o %t
RUN: not %t -seed=1 -runs=100000000 2>&1 | FileCheck %s
CHECK: ERROR: libFuzzer: deadly signal
