Add (back) `unsupported_calling_conventions` lint to reject more invalid calling conventions#141435

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RalfJung wants to merge 3 commits intorust-lang:masterfrom

RalfJung:unsupported_calling_conventions

Commits on May 23, 2025

add (back) unsupported_calling_conventions lint to reject more invalid calling conventions
RalfJung
committed
raw dylib: ensure that we have applied standard ABI checks
RalfJung
committed
avoid repeating error annotations in test file
RalfJung
committed