Add ES7/2016 SIMD

[dstorey]

• one of the most popular and most commented JS features on Edge userVoice: https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/6509545-simd-js
• implementation(s) are underway

[PaintNinja]

+1

[Schweinepriester]

Since

Efforts to extend JavaScript with more low-level features like SIMD.js has also been suspended since 2017.

and

SIMD.js has been taken out of active development in TC39 and removed from Stage 3, and is not being pursued by web browsers for implementation. SIMD operations exposed to the web are under active development within WebAssembly, with operations based on the SIMD.js operations. With WebAssembly in advanced development or shipping in multiple browsers, it seems like an adequate vehicle to subsume asm.js use cases, which are judged to be the broader cases. Although some developers have expressed interest in using SIMD.js outside of asm.js, implementers have found that implementing and optimizing for this case reliably creates a lot of complexity, and have made the decision to focus instead on delivering WebAssembly and SIMD instructions in WASM.

See https://github.com/WebAssembly/simd for current development.

(and also), I would argue this issue is largely superseded by #5077.

However, adding a search result for "SIMD.js" stating this succession and linking there would be nice.