Changed name of dummy function call __visc__clear to __visc__cleanup

llvm/test/VISC/parboil/benchmarks/lbm/src/visc/main.c

llvm/test/VISC/parboil/benchmarks/sgemm/src/visc/main.cc

llvm/test/VISC/parboil/benchmarks/spmv/src/visc/main.c

llvm/test/VISC/parboil/benchmarks/stencil/src/visc/stencil.c

llvm/test/VISC/parboil/common/include/visc.h