PPC: cleanup excludes

Updated excludes to remove SKIPs where possible. Either
removing if no longer needed or replacing with SLOW where
tests just need more time to run

	modified:   test/cctest/cctest.status
	modified:   test/mjsunit/mjsunit.status

R=danno@chromium.org, svenpanne@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1017073003

Cr-Commit-Position: refs/heads/master@{#27287}

test/cctest/cctest.status

@@ -397,20 +397,13 @@
 
 }],  # 'arch == nacl_ia32 or arch == nacl_x64'
 
-['arch == ppc64', {
-  #issue 2857
-  'test-log/EquivalenceOfLoggingAndTraversal' : [SKIP],
-  #test has assumption that does not hold for larger PPC page sizes
-  'test-heap/FirstPageFitsStartup' : [SKIP],
-}],  # 'arch == ppc64'
-
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {
 
   # Pass but take too long with the simulator.
-  'test-api/Threading1': [SKIP],
-  'test-api/Threading2': [SKIP],
-  'test-api/ExternalArrays': [SKIP],
+  'test-api/Threading1': [PASS, SLOW],
+  'test-api/Threading2': [PASS, SLOW],
+  'test-api/ExternalArrays': [PASS, SLOW],
 
 }],  # 'arch == ppc64 and simulator_run == True'
 ]

test/mjsunit/mjsunit.status

@@ -590,7 +590,6 @@
 
   # take too long with the simulator.
   'regress/regress-1132': [SKIP],
-  'asm/embenchen/box2d': [SKIP],
 
   # these two issues started after uplevel, believe they share common cause
   'debug-references': [SKIP],