Revert back to using __visc__init and cleanup without arguments. That is, they are no more DFG specific, rather just hints for compiler to insert compilation code

(1) Working on implementation of further lowereing the visc api by breaking the
DFG launch call into init, launch, wait, cleanup. There are issues pending when
these require some kind of inter procedural analysis to link init, launch, wait
and cleanup. This is necessary during code generation.
(2) Also contains changes which simplify GenVISC pass by using macro for
identifying various source __visc__ calls

(2) Added dummy function calls for visc initialization and visc clean up to
benchmarks and added support for it to all the passes.
(3) Timers are now only printed once
(4) Added extra timers to parboil header file

(2) Added another case for testing 2-level test case generation

type of the kernel function

functions to generate changes to host and kernel code