[instruction-scheduler][mips] Implement instruction-scheduler on mips

Also, remove cctest/test-instruction-scheduler/DeoptInMiddleOfBasicBlock
from skip-list.

Change-Id: I392cab0c96b7adc5e9c94eacb60c97e09f0ec16a
Reviewed-on: https://chromium-review.googlesource.com/1084591Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#53485}

test/cctest/cctest.status

@@ -304,11 +304,6 @@
   'test-serialize/StartupSerializerTwiceRunScript': [SKIP],
 }],  # 'arch == mipsel or arch == mips'
 
-['(arch == mipsel or arch == mips64el or arch == mips or arch == mips64)', {
-  # Instruction scheduler not supported on MIPS.
-  'test-instruction-scheduler/DeoptInMiddleOfBasicBlock': [SKIP]
-}],  # 'arch == mipsel or arch == mips64el or arch == mips or arch == mips64'
-
 ##############################################################################
 ['arch == mips', {
   # Too slow with TF.