Rollup of 7 pull requests

[matthiaskrgr]

Successful merges:

• Fix powerpc64 big-endian FreeBSD ABI #132150 (Fix powerpc64 big-endian FreeBSD ABI)
• don't show the full linker args unless --verbose is passed #133633 (don't show the full linker args unless --verbose is passed)
• Clarify how to use black_box() #133942 (Clarify how to use black_box())
• Try to evaluate constants in legacy mangling #134081 (Try to evaluate constants in legacy mangling)
• Remove Lexer's dependency on Parser. #134192 (Remove Lexer's dependency on Parser.)
• coverage: Tidy up creation of covmap and covfun records #134208 (coverage: Tidy up creation of covmap and covfun records)
• On Neutrino QNX, reduce the need to set archiver via environment variables #134211 (On Neutrino QNX, reduce the need to set archiver via environment variables)

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