Changes:
- Extend wasm/wasm-module-builder.cc to handle reference types.
- Add testing infrastructure to wasm-macro-gen.h for reference types.
- Add cc tests for ref types in blocks and globals.

Bug: v8:7748
Change-Id: I527252a768469e1493ecee9ecf4b4afaf8a8013b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2182377Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67679}