[instruction scheduler] Skip test for MIPS/MIPS64.

The instruction scheduler is not supported on these platforms.

Bug: v8:7577
Change-Id: If89494153407c6223e30d856dd0f3152eb0c5817
Reviewed-on: https://chromium-review.googlesource.com/973362Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
Cr-Commit-Position: refs/heads/master@{#52241}

test/cctest/cctest.status

@@ -297,6 +297,11 @@
   '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.