[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/fuzzer.test b/llvm/lib/Fuzzer/test/fuzzer.test
index 3a61778..d826fd7 100644
--- a/llvm/lib/Fuzzer/test/fuzzer.test
+++ b/llvm/lib/Fuzzer/test/fuzzer.test
@@ -57,3 +57,6 @@
 SINGLE_INPUTS: aaa:
 SINGLE_INPUTS: bbb:
 
+RUN: LLVMFuzzer-LeakTest -runs=10 2>&1 | FileCheck %s --check-prefix=LEAK
+LEAK: ERROR: LeakSanitizer: detected memory leaks
+LEAK-NOT: DEATH: