[llvm] r181729 - Mips assembler: Assembler macro ADDIU $rs,imm

[Tim Northover]

Hi Jack,

> This patch adds alias for addiu instruction which enables following syntax:
>
>     addiu $rs,imm
>
> The macro is translated as:
>
>     addiu $rs,$rs,imm

I'm not sure how generic this is in MIPS, but if there are more you
may want to look into the "TwoOperandAliasConstraint" field. It seems
to have been made to deal with this particular syntax variant.

Tim.