Ring of springs integration test using modulo

[martinjm97]

This PR is a slight change to the simplified springs example that changes the topology of the springs so that is a ring of 1D springs rather than a line of springs. Executing this code produced the following result on my machine:

Assertion failed: (abs(val) > 0.00001), function inner_store, file new_sparse.cpp, line 68.
[1]    24375 abort      ./new_sparse.out

[martinjm97]

The requested changes (most of which you made in our meeting :D) are in the updated branch. The dense code now works, but we run into issues for the auto-sparsified code.

Assertion failed: (i_nocapture < OperandTraits::operands(this) && "getOperand() out of range!"), function getOperand, file Instructions.h, line 2956.