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* Add synthesize uses at back edge.Nicolas Geoffray2015-04-293-0/+133
This reduces the cost of linearizing the graph (hence removing the notion of back edge). Since linear scan allocates/spills registers based on next use, adding a use at a back edge ensures we do count for loop uses. Change-Id: Idaa882cb120edbdd08ca6bff142d326a8245bd14