(1) Updated test cases to make mri-q work. Still not done ...

(2) Changes to DFGraph.h and visc-rt.cpp were not committed before.

M    llvm/test/VISC/parboil/benchmarks/mri-q/src/opencl/kernels.cl
M    llvm/test/VISC/parboil/benchmarks/mri-q/src/opencl/main.c
M    llvm/test/VISC/parboil/benchmarks/mri-q/src/opencl/macros.h
M    llvm/test/VISC/parboil/benchmarks/mri-q/src/opencl/ocl.c
M    llvm/test/VISC/parboil/benchmarks/mri-q/Makefile
M    llvm/include/llvm/IR/DFGraph.h
M    llvm/projects/visc-rt/visc-rt.cpp