Rollup of 10 pull requests

[fmease]

Successful merges:

• stabilize c-style varargs for sysv64, win64, efiapi, aapcs #144066 (stabilize c-style varargs for sysv64, win64, efiapi, aapcs)
• add span to struct pattern rest (..) #145783 (add span to struct pattern rest (..))
• resolve: Avoid a regression from splitting prelude into two scopes #145961 (resolve: Avoid a regression from splitting prelude into two scopes)
• Ensure we emit an allocator shim when only some crate types need one #145962 (Ensure we emit an allocator shim when only some crate types need one)
• Add compiler error when trying to use concat metavar expr in repetitions #146064 (Add compiler error when trying to use concat metavar expr in repetitions)
• alloc: make Cow From impls const #146067 (alloc: make Cow From impls const)
• rustdoc-search: skip loading unneeded fnData #146070 (rustdoc-search: skip loading unneeded fnData)
• fix a constness ordering bug in rustfmt #146089 (fix a constness ordering bug in rustfmt)
• Make Parser::parse_for_head public for rustfmt usage #146094 (Make Parser::parse_for_head public for rustfmt usage)
• Remove dead code stemming from an old effects desugaring #146102 (Remove dead code stemming from an old effects desugaring)

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