Added lit.local.cfg to add substitution of llvm_src in test cases

llvm/test/VISC/MatrixMultiplication/visc_gemm.ll

 ; RUN: opt -load LLVMBuildDFG.so -load LLVMDFG2LLVM_X86.so -load LLVMClearDFG.so -dfg2llvm-x86 -clearDFG -o %t.ll -S %s
-; RUN: llvm-link %t.ll ~/current-src/projects/visc-rt/visc-rt.ll -S -o %t.linked.ll
+; RUN: llvm-link %t.ll %llvm_src/projects/visc-rt/visc-rt.ll -S -o %t.linked.ll
 ; RUN: clang++ -O3 %t.linked.ll -lpthread -lOpenCL -o %t.bin
 ; RUN: %t.bin
 ; ModuleID = 'gemm_opencl.c'

llvm/test/VISC/MatrixMultiplication/visc_gemm_ptx.ll

 ; RUN: opt -load LLVMBuildDFG.so -load LLVMDFG2LLVM_NVPTX.so -load LLVMDFG2LLVM_X86.so -load LLVMClearDFG.so -dfg2llvm-nvptx -dfg2llvm-x86 -clearDFG -o %t.ll -S %s
 ; RUN: %S/metadata.py %s.kernels.ll %t.kernels.ll
 ; RUN: mv %t.kernels.ll %s.kernels.ll
-; RUN: llvm-link /home/psrivas2/Hetero/VISC/Code/trunk/libclc/built_libs/nvptx--nvidiacl.bc %s.kernels.ll -o %t.ll.kernels.linked.bc
+; RUN: llvm-link %llvm_src/../libclc/built_libs/nvptx--nvidiacl.bc %s.kernels.ll -o %t.ll.kernels.linked.bc
 ; RUN: clang -O3 -target nvptx %t.ll.kernels.linked.bc -S -o %s.nvptx.s
-; RUN: llvm-link %t.ll ~/current-src/projects/visc-rt/visc-rt.ll -S -o %t.linked.ll
+; RUN: llvm-link %t.ll %llvm_src/projects/visc-rt/visc-rt.ll -S -o %t.linked.ll
 ; RUN: clang++ -O3 %t.linked.ll -lpthread -lOpenCL -o %t.bin
 ; RUN: %t.bin
 ; ModuleID = 'gemm_opencl.c'

llvm/test/VISC/lit.local.cfg

+llvm_src = '/home/psrivas2/Hetero/VISC/Code/trunk/llvm'
+config.substitutions.append(('%llvm_src', llvm_src))