[llvm] [WebAssembly] Have source order as final tie breaker in register pressure sched module (PR #190643)

[Sam Parker via llvm-commits]

sparker-arm wrote:

>From my point of view, I think scheduling is something that the runtimes should do. V8 currently doesn't but it's one of the things I'm currently working on because there are clean gains to be had. IIRC cranelift does perform scheduling, which would explain why the performance diff is basically flat for wasmtime.

So, I think this would create a lot of churn for something better handled by the runtimes.

https://github.com/llvm/llvm-project/pull/190643