Compile-time hacks

[MikeInnes]

Avoid over-specialising IRTools code. Should result in lower compile times for dependencies.

IRCode(::TypedMeta) is removed since just_construct_ssa was removed from Base, and we don't use this method anyway.

[KristofferC]

@DhairyaLGandhi this is probably still useful?

[DhairyaLGandhi]

I'm hoping this should have an an impact on our compatibility with Julia master. I will run tests against this on some of the downstream packages, but it looks fairly straightforward so should be fine

[KristofferC]

I mostly meant the Base.Experimental.@optlevel 0 part for perhaps lower compilation times.

[DhairyaLGandhi]

Ah, gotcha. I think we've removed just_construct_ssa for the most part

[CarloLucibello]

closing as stale