Switch to the macos-12-xl builder

[pietroalbini]

This PR switches us to the macos-12-xl builders, a more powerful builder pool managed by GitHub for us.

[rustbot]

r? @jyn514

(rustbot has picked a reviewer for you, use r? to override)

[pietroalbini]

Let's see how good they run.

@bors try

[bors]

⌛ Trying commit 08020c9c9973e7eddee7c0aafd03d18f9b7d4844 with merge d4dedbdebbfe21c6285008640ae779af4f0bd7f7...

[bors]

☀️ Try build successful - checks-actions
Build commit: d4dedbdebbfe21c6285008640ae779af4f0bd7f7 (d4dedbdebbfe21c6285008640ae779af4f0bd7f7)

[jyn514]

hour and 9 minutes! 🎉

[pietroalbini]

Removed the do-not-merge commit. This is ready for review.

[jyn514]

@bors r+ p=15 speeds up CI for all PRs

[bors]

📌 Commit fcbae98 has been approved by jyn514

It is now in the queue for this repository.

[bors]

⌛ Testing commit fcbae98 with merge 2341517...

[bors]

☀️ Test successful - checks-actions
Approved by: jyn514
Pushing 2341517 to master...

[rust-timer]

Finished benchmarking commit (2341517): 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)	0.8%	[0.8%, 0.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.0%	[-2.4%, -1.7%]	2
All ❌✅ (primary)	-	-	0

Cycles

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