Experimenting with callee-saved registers for WebAssembly

[Pierre Langlois]

Hello V8 devs,

We recently did (another) investigation into using callee-saved
registers in V8, starting with WebAssembly. this time around we got as
far as producing a PoC CL with enough working to run (some) Wasm
workloads.

So we thought we'd share some early findings. In particular, we measured
significant improvements to overall compilation time using the wasmpspdfkit
benchmark, which we hadn't forseen.

Feedback and ideas very welcome!

Document: https://docs.google.com/document/d/12rfJEj1kwDtpthdR61ZHCFDuLbI-8HKJjLAXSfuh5n4
PoC CL: https://chromium-review.googlesource.com/c/v8/v8/+/5907403

Thanks,
Pierre
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