[wasm] Change default value of tables
The default value for table entries in WebAssembly tables is null when the table gets allocated from WebAssembly, but when the table gets allocated from JavaScript, the default value is undefined when the table type is externref. With this CL V8 handles the JavaScript case spec-compliant. R=manoskouk@chromium.org Bug: v8:12227 Change-Id: Ic8a1361629d8e5dfb59e2ee22a5e0ae0f6de936d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3162045 Commit-Queue: Andreas Haas <ahaas@chromium.org> Reviewed-by: Manos Koukoutos <manoskouk@chromium.org> Cr-Commit-Position: refs/heads/main@{#76892}
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