This reverts merge request !9

not). Code generation uses it.
- Added a policy that uses it.

Tested on pipeline benchmark.

Changes to pipeline example to work well with opencv 3.1. flann.hpp still has to be commented out from opencv.hpp to avoid compiling try catch throw with -fno-exceptions

Fixed pipeline code. Allows multiple runs within the code. Fixed visc.mk to support SPIR and PTX both

(2) modified makefiles to apply loop unroll and sroa optimizations to generated
kernel to get rid of private arrays
(3) Removed the call to remove declarations in SPIR backend

on the kernel. This promotes the private memory allocation in each thread to
registers.

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

(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