Replace two-operand instruction aliases that clang does not understand with the three-operand instructions.

[pfg]

Summary

No binary change with gas.
Obtained from: OpenBSD (CVS Rev. 1.9)

[pfg]

Note that I have no idea of MIPS asm, just noticed the commit on OpenBSD MIPS64 .. feel free to commit if it works for you.

[jhb]

I haven't needed this when building mips64 on clang 6. clang 7 can't build mips due to a different regression (but not in this file).

[imp]

In D19203#410890, @jhb wrote:

I haven't needed this when building mips64 on clang 6. clang 7 can't build mips due to a different regression (but not in this file).

IIRC, OpenBSD needed this only for older versions of clang that didn't really support mips assembler completely (can't recall if those were the in-tree ones, or the snapshots by the folks doing the mips port). I helped Ed with a number of these a while ago. My sense is that we shouldn't do this unless we have a demonstrated need. Though, having said that, this change doesn't hurt anything.

[pfg]

If it's not needed then just lets not spend time on it.