Add simple libfuzzer based test.

This tests the verifier and the parser.

Tested: on Linux.
Bug: 27230459
Change-Id: I3417faba9385dc941199c57a08d8a50c2faec1aa

tests/fuzzer/build_fuzzer.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+#
+# Copyright 2015 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+git clone https://chromium.googlesource.com/chromium/llvm-project/llvm/lib/Fuzzer
+clang++ -c -g -O2 -std=c++11 Fuzzer/*.cpp -IFuzzer
+ar ruv libFuzzer.a Fuzzer*.o
+rm -rf Fuzzer *.o