Remove optimal xz settings from CI

[Mark-Simulacrum]

This is a companion PR to rust-lang/promote-release#58, which moves the relevant optimal code to rust-lang/promote-release. As mentioned in the comments of that PR, this is expected to cut CI costs (and time, though predominantly felt on fast builders) and reduce wasted resources due to in-practice single-threaded compression not using the full 8+ vCPU builders we have available.

This probably shouldn't land before that PR + a simpleinfra change to enable the recompression of xz artifacts. But if it does land, it's just a matter of a few nightlies with slightly larger artifacts, so not a big deal.

r? @pietroalbini

[Mark-Simulacrum]

@bors try

[bors]

⌛ Trying commit 0da526b with merge c7d503a4986575621b97e3ec5e7e5403c4f9d55c...

[bors]

☀️ Try build successful - checks-actions
Build commit: c7d503a4986575621b97e3ec5e7e5403c4f9d55c (c7d503a4986575621b97e3ec5e7e5403c4f9d55c)

[pietroalbini]

r=me

[Mark-Simulacrum]

@bors r=pietroalbini rollup=iffy

promote-release should recompress back to small sizes now that rust-lang/promote-release#58 has landed, so this should be good to go.

[bors]

📌 Commit 0da526b has been approved by pietroalbini

It is now in the queue for this repository.

[Mark-Simulacrum]

@bors rollup=never - want to avoid putting this in a rollup actually, to give a clear step on timings

[bors]

⌛ Testing commit 0da526b with merge bd991d9...

[bors]

☀️ Test successful - checks-actions
Approved by: pietroalbini
Pushing bd991d9 to master...

[rust-timer]

Finished benchmarking commit (bd991d9): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.1%	[3.1%, 3.1%]	1
Improvements ✅ (primary)	-1.0%	[-1.0%, -1.0%]	1
Improvements ✅ (secondary)	-2.1%	[-3.1%, -1.2%]	2
All ❌✅ (primary)	-1.0%	[-1.0%, -1.0%]	1

Cycles

This benchmark run did not return any relevant results for this metric.