Skip test-run-machops/RunComputedCodeObject on AIX and PPC64BE.

This test, as written, is invalid on platforms which use function
descriptors.

See https://codereview.chromium.org/1377423002/ for background.

R=mstarzinger@chromium.org, titzer@chromium.org, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1438803002

Cr-Commit-Position: refs/heads/master@{#31967}

test/cctest/cctest.status

@@ -450,6 +450,14 @@
 
 }],  # 'system == aix and arch == ppc64'
 
+##############################################################################
+['system == aix or (arch == ppc64 and byteorder == big)', {
+
+  # Test currently broken for platforms with function desciptors
+  'test-run-machops/RunComputedCodeObject' : [SKIP],
+
+}],  # 'system == aix or (arch == ppc64 and byteorder == big)'
+
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {