Added a patch approved in future llvm branches which stop argument promotion for variagic functions. This was required to stop auto promotion of arguments in __visc__ calls

code enquires about its ancestor. Enables to run visc parboil benchmarks on x86
alone

(2) Modified unittests to have llvm.visc.init and cleanup intrinsics. Now they
all pass

(3) Modified visc.mk to easily compile visc version for just x86. Pass
TARGET=x86 as option to make command

(2) Added a compiled ptx assembly file for sgemm. Working for sgemm

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) Modified parboil script to run each test multiple times based on
configuration

(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