I'm just passing this patch on to the list as I know Brian is busy and I
had proded him to file the bug report.
"binutils on OpenBSD is quite old, which causes the build on mips64el to fail on
MipsJITInfo.cpp - it complains of illegal operands. The attachment patches it
so that it will build. All the patch does is replace the register aliases with
the actual register (i.e. changing $sp to $29). The registers are identical to
both mips and mips64, so it should not disrupt 32-bit Mips builds."