[libFuzzer] print a stack trace on timeout

llvm-svn: 250571
diff --git a/llvm/lib/Fuzzer/test/fuzzer.test b/llvm/lib/Fuzzer/test/fuzzer.test
index dccc5e4..1c29c75 100644
--- a/llvm/lib/Fuzzer/test/fuzzer.test
+++ b/llvm/lib/Fuzzer/test/fuzzer.test
@@ -14,6 +14,11 @@
 RUN: not LLVMFuzzer-TimeoutTest -timeout=5 2>&1 | FileCheck %s --check-prefix=TimeoutTest
 TimeoutTest: ALARM: working on the last Unit for
 TimeoutTest: Test unit written to ./timeout-
+TimeoutTest: == ERROR: libFuzzer: timeout after
+TimeoutTest: #0
+TimeoutTest: #1
+TimeoutTest: #2
+TimeoutTest: SUMMARY: libFuzzer: timeout
 
 RUN: not LLVMFuzzer-TimeoutTest -timeout=5 -test_single_input=%S/hi.txt 2>&1 | FileCheck %s --check-prefix=SingleInputTimeoutTest
 SingleInputTimeoutTest: ALARM: working on the last Unit for