Rollup of 9 pull requests

[matthiaskrgr]

Successful merges:

• Fix tty detection for msys2's /dev/ptmx #119664 (Fix tty detection for msys2's /dev/ptmx)
• never_patterns: Count ! bindings as diverging #120104 (never_patterns: Count ! bindings as diverging)
• Move cmath into sys #120109 (Move cmath into sys)
• Consolidate logic around resolving built-in coroutine trait impls #120143 (Consolidate logic around resolving built-in coroutine trait impls)
• Track verbose and verbose_internals #120159 (Track verbose and verbose_internals)
• compiler: update freebsd and netbsd base specs. #120188 (compiler: update freebsd and netbsd base specs.)
• Fix a trimmed_def_paths assertion failure. #120216 (Fix a trimmed_def_paths assertion failure.)
• Document Token{Stream,Tree}::Display more thoroughly. #120220 (Document Token{Stream,Tree}::Display more thoroughly.)
• Revert stabilization of trait_upcasting feature #120233 (Revert stabilization of trait_upcasting feature)

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