[wasm] Write fuzzers for single wasm sections.

test/fuzzer/wasm-function-sigs-section.cc

Index: test/fuzzer/wasm-function-sigs-section.cc
diff --git a/test/fuzzer/wasm-function-sigs-section.cc b/test/fuzzer/wasm-function-sigs-section.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1f685f6ea4be0da4deef68b3e6ce4414cb8e7525
--- /dev/null
+++ b/test/fuzzer/wasm-function-sigs-section.cc
@@ -0,0 +1,10 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "test/fuzzer/wasm-section-fuzzers.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  return fuzz_wasm_section(
+      v8::internal::wasm::WasmSection::Code::FunctionSignatures, data, size);
+}