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For parameters and return types of functions with the C calling convention, the LLVM backend now has a special lowering for the function type that makes the function adhere to the C ABI. The AIR instruction lowerings for call, ret, and ret_load are adjusted to bitcast the real type to the ABI type if necessary. More work on this will need to be done, however, this improvement is enough that stage3 now passes all the same behavior tests that stage2 passes - notably, translate-c no longer has a segfault due to C ABI issues with Zig's Clang C API wrapper.