TableCache.FindTable() to avoid the mem copy of file number
Summary: I'm not sure what's the purpose of encoding file number to a new buffer for looking up the table cache. It seems to be unnecessary to me. With this patch, we point the lookup key to the address of the int64 of the file number. Test Plan: make all check Reviewers: dhruba, haobo, igor, kailiu Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D14811
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