TrapIf and TrapUnless had an effect input, but not an effect output.
This is not canonical for Turbofan graphs. This CL puts them properly
into the effect chain.

Drive-by:
- Remove premature optimization in WasmGraphBuilder::TrapIfEq{32,64}.
- Change LoadFromObject to Load when loading from a stack slot.

Change-Id: I3fc43e693fa0507406dc31208e487026b0e5156b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3714240Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81318}