Adding dummy baseline value to tuner config files

llvm/test/VISC/DNN_Benchmarks/benchmarks/alexnet/data/tuner_confs.txt

+2000
 +++++
-conf1 3.86 79.1
+conf1 3.86 0 79.1 0.0
 1 gpu conv fp32 1 add fp32 1 tanh fp32 1 pool_max fp32 1
 2 gpu conv fp32 1 add fp32 1 tanh fp32 1 pool_max fp32 1
 3 gpu conv fp32 1 add fp32 1 tanh fp32 1 

llvm/test/VISC/DNN_Benchmarks/benchmarks/alexnet2/data/tuner_confs.txt

+2000
 +++++
 conf1 2.64294896823 0 84.24999995 -0.05999995000000524
 1 gpu conv fp32 1 add fp32 1 tanh fp32 1