Fix bug found by fuzzer.

Also, add the demangle fuzzer code.

Test: Ran fuzzer, ran new unit tests.
Change-Id: If3e15e10af88b81602a8a0f0bfe071a015f6000b
diff --git a/demangle/Android.mk b/demangle/Android.mk
new file mode 100644
index 0000000..e3cfc2a
--- /dev/null
+++ b/demangle/Android.mk
@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# 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.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := demangle_fuzzer
+LOCAL_MODULE_TAGS := optional
+LOCAL_SRC_FILES := \
+    Demangler.cpp \
+    demangle_fuzzer.cpp \
+
+LOCAL_CFLAGS := \
+    -Wall \
+    -Werror \
+    -Wextra \
+
+include $(BUILD_FUZZ_TEST)