Rollup of 4 pull requests

[tgross35]

Successful merges:

• Add platform docs for FreeBSD. #129220 (Add platform docs for FreeBSD.)
• test-infra: improve compiletest and run-make-support symlink handling #134659 (test-infra: improve compiletest and run-make-support symlink handling)
• Make sure we don't lose default struct value when formatting struct #134668 (Make sure we don't lose default struct value when formatting struct)
• Revert stabilization of the #[coverage(..)] attribute #134672 (Revert stabilization of the #[coverage(..)] attribute)

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