We are not allowed to use t0 and t1 as temporary registers in
macro assembler as they are allocatable. This CL fixes the
issue.

Change-Id: I328532e669b081e5215887b725b0b645a86d98b1
Reviewed-on: https://chromium-review.googlesource.com/951488
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Reviewed-by: Sreten Kovacevic <sreten.kovacevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#51773}