Experimental Valhalla branch

Creating a testing and benchmarking branch for the upcoming [Project Valhalla](https://openjdk.java.net/projects/valhalla/) features to see if there is an improvement in speed. Good starting example might be [here](https://github.com/openjdk/valhalla/blob/lworld/test/micro/org/openjdk/bench/valhalla/lworld/matrix/Complex.java).