Added SmallProblemSize support for most Polybench Kernel Tests.

Specifically I added it for: 2mm, 3mm, cholesky, doitgen, gemm, symm, syr2k,
syrk, and trmm.

I additionally converted gesummv to use hashed outputs as a bonus.

rdar://11907111.

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@175240 91177308-0d34-0410-b5e6-96231b3b80d8