Fixing tabs in global knobs file

llvm/projects/hpvm-tensor-rt/opentuner/data/global_knobs.txt

 fp32,11	-1	1.0	tensorConvolution	tensorConvolution
-fp16,12	-1	1.5     tensorConvolution	tensorHalfConvolution
-perf,21 1,2,0	2.25    tensorConvolution	tensorConvPerfCuda
-perf,22 1,2,1   2.25    tensorConvolution	tensorConvPerfCuda
-perf,23 1,3,0	1.88	tensorConvolution	tensorConvPerfCuda
-perf,24	1,3,1   1.88	tensorConvolution	tensorConvPerfCuda
-perf,25	2,1,0   2.25	tensorConvolution	tensorConvPerfCuda
-perf,26	2,1,1   2.25	tensorConvolution	tensorConvPerfCuda
-perf,27	3,1,0   1.88	tensorConvolution	tensorConvPerfCuda
-perf,28	3,1,1   1.88	tensorConvolution	tensorConvPerfCuda
-samp,31	2,0     2.25	tensorConvolution	tensorConvSampSim
-samp,32	2,1     2.25	tensorConvolution	tensorConvSampSim
-samp,33	4,0     1.8	tensorConvolution	tensorConvSampSim
-samp,34	4,1     1.8	tensorConvolution	tensorConvSampSim
+fp16,12	-1	1.5	tensorConvolution	tensorHalfConvolution
+perf,21	1,2,0	2.25	tensorConvolution	tensorConvPerfCuda
+perf,22	1,2,1	2.25	tensorConvolution	tensorConvPerfCuda
+perf,23	1,3,0	1.88	tensorConvolution	tensorConvPerfCuda
+perf,24	1,3,1	1.88	tensorConvolution	tensorConvPerfCuda
+perf,25	2,1,0	2.25	tensorConvolution	tensorConvPerfCuda
+perf,26	2,1,1	2.25	tensorConvolution	tensorConvPerfCuda
+perf,27	3,1,0	1.88	tensorConvolution	tensorConvPerfCuda
+perf,28	3,1,1	1.88	tensorConvolution	tensorConvPerfCuda
+samp,31	2,0	2.25	tensorConvolution	tensorConvSampSim
+samp,32	2,1	2.25	tensorConvolution	tensorConvSampSim
+samp,33	4,0	1.8	tensorConvolution	tensorConvSampSim
+samp,34	4,1	1.8	tensorConvolution	tensorConvSampSim