Move tier-2 (without host tools) apple targets to separate builder

[Mark-Simulacrum]

One-off (likely fairly unreliable, but give some idea) measurements:

• dist-apple-various (new): 2h10m
• dist-x86_64-apple: 2h55m -> 2h36m (cutting roughly 20 minutes)

[bors]

☀️ Try build successful - checks-actions
Build commit: e44ea7de1cd5f0d621aa3305d2eeb8697a9d4f4c (e44ea7de1cd5f0d621aa3305d2eeb8697a9d4f4c)

[Mark-Simulacrum]

r? @pietroalbini

[pietroalbini]

@bors r+

[bors]

📌 Commit b726f28 has been approved by pietroalbini

[Mark-Simulacrum]

@bors rollup p=1 since we expect this to speed up CI times

[bors]

⌛ Testing commit b726f28 with merge 24ae996...

[bors]

☀️ Test successful - checks-actions
Approved by: pietroalbini
Pushing 24ae996 to master...

[rust-timer]

Finished benchmarking commit (24ae996): comparison url.

Summary: This benchmark run did not return any relevant results.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

[Mark-Simulacrum]

Initial results look pretty promising on the dist-x86_64-apple builder:

Looks like the x86_64-apple builder is probably the next priority, and I expect some amount of further decrease as the median firms up at a lower boundary in the next few days.