Get rid of some shared_ptrs
Summary: I went through all remaining shared_ptrs and removed the ones that I found not-necessary. Only GenerateCachePrefix() is called fairly often, so don't expect much perf wins. The ones that are left are accessed infrequently and I think we're fine with keeping them. Test Plan: make asan_check Reviewers: dhruba, haobo Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D14427
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