[llvm-demangle-fuzzer] Also fuzz microsoftDemangle().

Summary:
Use first byte of input to determine whether to call itaniumDemangle()
or microsoftDemangle().

Addresses https://bugs.llvm.org/show_bug.cgi?id=39582.

Reviewers: kcc, thakis

Reviewed By: kcc, thakis

Subscribers: mgorny, thakis, erik.pilkington, llvm-commits

Differential Revision: https://reviews.llvm.org/D54780

llvm-svn: 350534
diff --git a/llvm/tools/llvm-microsoft-demangle-fuzzer/llvm-microsoft-demangle-fuzzer.cpp b/llvm/tools/llvm-microsoft-demangle-fuzzer/llvm-microsoft-demangle-fuzzer.cpp
new file mode 100644
index 0000000..4c1a413
--- /dev/null
+++ b/llvm/tools/llvm-microsoft-demangle-fuzzer/llvm-microsoft-demangle-fuzzer.cpp
@@ -0,0 +1,21 @@
+//===--- llvm-demangle-fuzzer.cpp - Fuzzer for the Itanium Demangler ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Demangle/Demangle.h"
+
+#include <cstdint>
+#include <cstdlib>
+#include <string>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  std::string NullTerminatedString((const char *)Data, Size);
+  free(llvm::microsoftDemangle(NullTerminatedString.c_str(), nullptr, nullptr,
+                               nullptr));
+  return 0;
+}