PPC: Ensure predictable code size at map_check in LCodeGen::DoInstanceOfKnownGlobal.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 885f7e09639bf5b40dcc864c1aa6a1d09a46e489..d21e5948a347558da79c787a25e3269bc240d752 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -606,9 +606,5 @@
 
   # take too long with the simulator.
   'regress/regress-1132': [SKIP],
-
-  # these two issues started after uplevel, believe they share common cause
-  'debug-references': [SKIP],
-  'mirror-object': [SKIP],
 }],  # 'arch == ppc and simulator_run == True'
 ]