[wasm] Disassemble wasm code from script
This stores the wasm object and the function index in the script, and adds functions to get the disassembled wasm code as well as the offset table mapping from byte position to line and column in the disassembly solely from the script. This will be used to show "ui source code" in DevTools, and map raw locations from the stack trace into this code view. R=yangguo@chromium.org, ahaas@chromium.org, titzer@chromium.org BUG=chromium:613110 patch from issue 2063013004 at patchset 80001 (http://crrev.com/2063013004#ps80001) Review-Url: https://codereview.chromium.org/2105303002 Cr-Commit-Position: refs/heads/master@{#37430}
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