7011857: java/util/concurrent/Phaser/FickleRegister.java fails on solaris-sparc

Summary: Remove from ProblemList, failure resolved by 7009231
Reviewed-by: alanb

test/ProblemList.txt

@@ -734,8 +734,5 @@ java/util/concurrent/locks/Lock/TimedAcquireLeak.java		generic-all
 # Fails on solaris-sparc -server (Set not equal to copy. 1)
 java/util/EnumSet/EnumSetBash.java			 	solaris-sparc
 
-# Fails on solaris-sparc, see 7011857
-java/util/concurrent/Phaser/FickleRegister.java			solaris-sparc
-
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