Rollup merge of #157076 - bjorn3:proc_macro_refactors4, r=petrochenkov Various proc-macro related code cleanups Some are just misc cleanups. Others are to make the proc-macro ABI and RPC interface a bit less target dependent. I've got some local changes that change the ABI to what is effectively a single `&[extern "C" fn(BridgeConfig<'_>) -> Buffer]` export.
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