[libfuzzer][v8][wasm] Add new WebAssembly fuzzers.

This CL introduces seven new fuzzers for WebAssembly which test the
decoding of single sections in the WebAssembly module decoder.

R=mmoroz@chromium.org

Review-Url: https://codereview.chromium.org/2344823002
Cr-Commit-Position: refs/heads/master@{#418828}
1 file changed