[libFuzzer] don't write the test unit when a leak is detected (since we don't know which unit causes the leak)

llvm-svn: 259731
diff --git a/llvm/lib/Fuzzer/test/LeakTest.cpp b/llvm/lib/Fuzzer/test/LeakTest.cpp
new file mode 100644
index 0000000..7d153e4
--- /dev/null
+++ b/llvm/lib/Fuzzer/test/LeakTest.cpp
@@ -0,0 +1,11 @@
+// Test with a leak.
+#include <cstdint>
+#include <cstddef>
+
+static volatile void *Sink;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  Sink = new int;
+  return 0;
+}
+