cmu-db / peloton / 5868

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Performance Fixes: pass TileGroupHeader*, avoid RW set lookups (#1380)

* Performance Fixes

 * add TileGroupHeader* as argument to ReadRecord to avoid lookup
   with GetTileGroup()
 * rewrite access to RW set in TransactionContext::Record* functions
   to avoid duplicated lookups

* Change RW set find to return non-const iterator

It also worked with const iterators, but it violates the const correctness.
It seems this is not done correctly in tbb.

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