Add SDL and SDR instructions to disassembler on MIPS64.

Bug: 
Change-Id: I9cfcfe05d34aa483b8f7504267b76a782dd06558
Reviewed-on: https://chromium-review.googlesource.com/856676Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#50429}