An optimization to the function of findGlobalPool#1442

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zhaozhangjian wants to merge 2 commits intoROCm:clang_tot_upgradefrom

zhaozhangjian:clang_tot_upgrade

Commits on Apr 8, 2020

In findGlobalPool, return once a fine grained global pool is found to avoid useless iterations. Also add an ErrorCheck in the constructor of UnpinnedCopyEngine accordingly.
zhaozhangjian
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Commits on Apr 28, 2020

Avoid unnecessary lock when getting thread local queue
zhaozhangjian
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