[libFuzzer] Mark a test that infinite loops as unsupported

We need to investigate this, but for now it just causes too much
headache when trying to run these tests.

llvm-svn: 295900
diff --git a/llvm/lib/Fuzzer/test/trace-malloc-2.test b/llvm/lib/Fuzzer/test/trace-malloc-2.test
new file mode 100644
index 0000000..7719b65
--- /dev/null
+++ b/llvm/lib/Fuzzer/test/trace-malloc-2.test
@@ -0,0 +1,8 @@
+// FIXME: This test infinite loops on darwin because it crashes
+// printing a stack trace repeatedly
+UNSUPPORTED: darwin
+
+RUN: LLVMFuzzer-TraceMallocTest -seed=1 -trace_malloc=2 -runs=1000 2>&1 | FileCheck %s --check-prefix=TRACE2
+TRACE2-DAG: FREE[0]
+TRACE2-DAG: MALLOC[0]
+TRACE2-DAG: in LLVMFuzzerTestOneInput