[SPARK-15045] [CORE] Remove dead code in TaskMemoryManager.cleanUpAllAllocatedMemory for pageTable#12829

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abhi951990 wants to merge 2 commits intoapache:masterfrom

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Commits on May 2, 2016

Update TaskMemoryManager.java
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Commits on May 5, 2016

Updated the new patch by rewriting the synchronized block
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