Doug Gregor 9ea8671c3f Use @c instead of @_cdecl in the Embedded Swift runtime ...

This change moves us toward the official feature, and eliminates the
extra level of "thunk" that was implied by `@_cdecl`. Amusingly, this
trips up the LLVM-level ARC optimizations, because we are trying to
perform ARC optimizations within the retain/release runtime functions.
Teach those optimization passes to leave swift_retainN et al alone.

2025-11-13 18:39:10 -08:00

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