[wasm][eh] Add WebAssembly.Exception constructor
WebAssembly.Exception is the static representation of a wasm exception. It holds the signature and the tag of the exception, can be imported and exported from a wasm module, and will eventually allow inspecting a wasm-thrown exception from JS. R=clemensb@chromium.org Bug: v8:8091 Change-Id: Ided352777e1217e6f873b84a2fc21c3acf59ff6c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2966384Reviewed-by:Clemens Backes <clemensb@chromium.org> Commit-Queue: Thibaud Michaud <thibaudm@chromium.org> Cr-Commit-Position: refs/heads/master@{#75214}
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