[interpreter/runtime] Simplify how global declarations are processed
This makes the code a little more specific to what's happening: There is only 1 global scope, and if there is one, we know its declarations are info->scope()->declarations(). That means we don't need multiple GlobalDeclarationsBuilders, and we don't need to cache partially serialized versions of the declarations. One builder is enough, and we can simply walk those declarations if there are any. Additionally this CL drops unnecessary information passed into DeclareGlobals: - Global functions always have the name on the shared function info, so we can drop the name. - Due to lazy feedback vectors there's no point in trying to preinitialize global loads. Also this was only preinitializing global loads at the script level, not sub functions; without even checking whether the global load was used. It may actually have caused us to do more work and allocate more global load feedback slots than neccessary. Change-Id: Ibbdd029abe5a39ba27f7fc9be84670c5d444d98d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1997123 Commit-Queue: Toon Verwaest <verwaest@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/master@{#65725}
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