Add a first pass of optimization in CUDA kernels
Add a first pass of optimization in CUDA kernels

Conflicts:
	opensubdiv/osd/cudaKernel.cu

poljere/OpenSubdiv,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv,takahito-tejima/OpenSubdiv,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,jcowles/OpenSubdiv,c64kernal/OpenSubdiv,shengfuintel/OpenSubdiv,anshuarya/OpenSubdiv,c64kernal/OpenSubdiv,c64kernal/OpenSubdiv,poljere/OpenSubdiv,xldeveloper/OpenSubdiv,xldeveloper/OpenSubdiv,lookup1980/OpenSubdiv,poljere/OpenSubdiv,anshuarya/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,xldeveloper/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,nyotis/OpenSubdiv,shengfuintel/OpenSubdiv,jcowles/OpenSubdiv