[libfuzzer] adding license headers to cpp files

Differential Revision: http://reviews.llvm.org/D18705

llvm-svn: 265174
diff --git a/llvm/lib/Fuzzer/test/CallerCalleeTest.cpp b/llvm/lib/Fuzzer/test/CallerCalleeTest.cpp
index 150b2fc0..3ec025d 100644
--- a/llvm/lib/Fuzzer/test/CallerCalleeTest.cpp
+++ b/llvm/lib/Fuzzer/test/CallerCalleeTest.cpp
@@ -1,3 +1,6 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
 // Simple test for a fuzzer.
 // Try to find the target using the indirect caller-callee pairs.
 #include <cstdint>