[test-suite] Adding the HPCCG benchmark

HPCCG: A simple conjugate gradient benchmark code for a 3D chimney domain on an
arbitrary number of processors.

This simple benchmark code is a self-contained piece of C++ software that
generates a 27-point finite difference matrix with a user-prescribed sub-block
size on each processor.

Web: https://mantevo.org/packages/
github: https://github.com/Mantevo/HPCCG

On our 2.2 GHz Intel Xeon (E5-2660):
compile_time: 56.9292
exec_time: 0.7010
Maximum resident set size (kbytes): 193952

Patch by Brian Homerding, thanks!

Differential Revision: https://reviews.llvm.org/D36582

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@310951 91177308-0d34-0410-b5e6-96231b3b80d8
38 files changed