Calling code for argument-struct-to-stack/register spilling
x86_64 call passes arg_stack to spill_struct_to_stack()
Simple beginning of small-struct argument passing
Pulled out rax:rdx logic from x86_64 stret code
Register pair overlaying for struct pass-by-value
Remove -fcall-used-rbx from abi.mk XCCFLAGS
Offset struct-argument test
abi.mk: each object file depends on cc1
funcargs_ty_calc recursively counts structs
x86_64 backend always uses mov for argument register spill