Rollup merge of #108367 - compiler-errors:xl-builders-again, r=pietroalbini

Re-apply "switch to the macos-12-xl builder"

This reverts commit e63ec2e1402eaff949e5c53b8f6062b152010fcc, essentially re-applying fcbae989ae790d5b9a0a23ceba242d0b0d4e6c5b.

r? ````@pietroalbini````

Author: matthiaskrgr