Summary:
Add a document which describes:
- GEMM performance comparison.
- An experiment that measures the compile time impact
of enabling Polly when compiling LLVM+Clang+Polly.
Contributed-by: Theodoros Theodoridis<theodoros.theodoridis@inf.ethz.ch>
Differential Revision: https://reviews.llvm.org/D38330
llvm-svn: 314419