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nativeGen: One approach to fix #18527

Ben Gamari requested to merge wip/T18527 into master

Previously the code generator could produce corrupt C call sequences due to register overlap between MachOp lowerings and the platform's calling convention. We fix this using a hack described in Note [Evaluate C-call arguments before placing in destination registers].

Fixes #18527 (closed).

Edited by Ben Gamari

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