llvm dev - Oct 2015 - backend handles "return" instruction

Hi,

I want to implement a backend. In my backend, there is no stack. For the
"return" instruction, if I have LLVM IR looks like this "%1 = add
i32 %2,
%3" and "ret i32 %1". I hope my backend can print something like
"add v1,
v2, v3" and "return v1". I checked some tutorials such as
"OpenRISC",
"MSP430" and "LEG" backend, they all "return" to a
particular register.
However, this is not what I want.

I appreciate it if you could any me any suggestion how to  handle the
"return" instruction here? I guess I need to change both InstInfo.td
and
ISelLowing.cpp file. However, I have no idea right now.

Thanks,

Xiangyang
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