Consider using unoptimized IR locally

[PaulRBerg]

Basically, enable via IR but disable the optimizer in the lite profile. As per @cameel's suggestion:

[smol-ninja]

I ran a few experiments and here are the results for v2-core.

1. Building only src

Build time	$\text{ir = true}$	$\text{ir = false}$
$\text{optimizer = true}$	1m 39s	5.63s
$\text{optimizer = false}$	30.47s	1.85s

2. Building both src and test

Build time	$\text{ir = true}$	$\text{ir = false}$
$\text{optimizer = true}$	1h 10m 5s	2m 47s
$\text{optimizer = false}$	23m 6s	80.54s

With unoptimised IR, the repo build time is ~23 mins. Considering the lite profile is only used during development and we need to build both src and test, I think via_ir = false is fine even if the generated bytecodes are different. Wdyt?

[PaulRBerg]

Exactly what I wanted to see. Thanks for running these checks.

I find it obvious to stick with our existing set-up and NOT use via IR locally. I will let Cameel know.