Add test program to verify convolution implementation

Convolution is a complex process and we should be able to verify
if computing results change when the implementation is touched.

This commit adds a test program that executes some testcases.
The testcases are crafted in a way that every implmentation
(several different ones for SSE) is executed once. The output
can be compared against the included .ok file.

Change-Id: Ic702ecb356c652fbcd76bee689717fb5d3526fe9
3 files changed