[wasm] Add support for multiple indirect function tables
This patch updates internal data structures used by V8 to support multiple indirect function tables (WebAssembly/design#682). But, since this feature is post-MVP, the functionality is not directly exposed and parsing/generation of WebAssembly is left unchanged. Nevertheless, it is being used in an experiment to implement fine-grained control flow integrity based on C/C++ types. BUG= Review-Url: https://codereview.chromium.org/2174123002 Cr-Commit-Position: refs/heads/master@{#38110}
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