[Mono-dev] [PATCH] fix support for small struct in regs for

[Rodrigo Kumpera]

Hey Zoltan,

Attached is a stretch of the fix to support 8 bytes structs in regs on x86.

What I noticed from the current code is that mono_decompose_vtype_opts
doesn't have a clue on which regs the return value is presented.
It works by pure luck since both amd64 and x86 uses EAX/RAX (0) for the
first one.

But to proper support return in a reg pair we need to give it such
knowledge.

The attached patch is not final and still requires something like a
mono_arch_get_vret_reg to inform mono_decompose_vtype_opts about the regs to
use.

Please review it so I know if this is the right approach and can proceed
with finishing it.

Thanks,
Rodrigo
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