Improve qrt::exp() kernel composition time
Created by: tnguyen-ornl
Fixes https://github.com/ORNL-QCI/qcor/issues/92
Also, add a unit test to make sure QCOR's exp
kernel matches the reference XACC circuit.
Created by: tnguyen-ornl
Fixes https://github.com/ORNL-QCI/qcor/issues/92
Also, add a unit test to make sure QCOR's exp
kernel matches the reference XACC circuit.