Enabled support for Power9 hardware and implemented P9 modulo
instruction.

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, jochen@chromium.org
BUG=
LOG=n

Review-Url: https://codereview.chromium.org/2625013002
Cr-Commit-Position: refs/heads/master@{#42341}