Rollup of 7 pull requests

[JohnTitor]

Successful merges:

• Refactor sync::Once #65719 (Refactor sync::Once)
• Don't cast directly from &[T; N] to *const T #65831 (Don't cast directly from &[T; N] to *const T)
• Correct error in documentation for Ipv4Addr method #66048 (Correct error in documentation for Ipv4Addr method)
• Correct deprecated is_global IPv6 documentation #66058 (Correct deprecated is_global IPv6 documentation)
• [mir-opt] Handle return place in ConstProp and improve SimplifyLocals pass #66216 ([mir-opt] Handle return place in ConstProp and improve SimplifyLocals pass)
• invalid_value lint: use diagnostic items #66217 (invalid_value lint: use diagnostic items)
• rustc_metadata: don't let LLVM confuse rmeta blobs for COFF object files. #66235 (rustc_metadata: don't let LLVM confuse rmeta blobs for COFF object files.)

Failed merges:

r? @ghost