Changes:
- Move some helper functions into WasmGraphBuilder.
- Introduce call_mode and null_check as additional arguments to
  WasmGraphBuilderInterface::DoCall/DoReturnCall.
- Introduce ValueType::is_strict_reference_type.
- Improve usage of ValueType API.

Bug: v8:9495
Change-Id: Id3fb9f0d7a4770475ac895b03b38bfa7f2fec252
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2343083
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69372}