[w3ctag/design-reviews] WebAssembly SIMD review (#487)

Hello TAG!

I'm requesting a TAG review of WebAssembly SIMD.

  - Explainer: https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md

  - Proposal directory: https://github.com/WebAssembly/simd/tree/master/proposals/simd

  - Example usage and demos: https://v8.dev/features/simd

  - Tests: https://github.com/WebAssembly/simd/tree/master/test/core/simd

  - Security and Privacy self-review: There are no known security or privacy impacts of this feature.
  - GitHub repo: https://github.com/WebAssembly/simd

  - Primary contacts:
      - [Deepti Gandluri]([dtig]), [Google]
      - [Thomas Lively]([tlively]), [Google]
      - [Zhi An Ng]([ngzhian]), [Google]
      - [Arun Purushan]([arunetm]), [Intel]
  - External status/issue trackers for this feature:
https://www.chromestatus.com/feature/6533147810332672


Further details:

  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done: WebAssembly Community Group
  - The group where standardization of this work is intended to be done: WebAssembly Working Group

You should also know that...

This is purely a WebAssembly performance feature that does not not affect web API behavior, but is still useful for developers to be aware of as it can change performance characteristics of applications using WebAssembly. It adds a new 128-bit value type that is not exposed to JavaScript and several new opcodes for vector operations that are documented [here](https://github.com/WebAssembly/simd/blob/master/proposals/simd/BinarySIMD.md). 

We'd prefer the TAG provide feedback as:

  🐛 open issues in our GitHub repo for **each point of feedback**


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