[AOT][Testing] Print output values on test failure

[lhutton1]

This commit enhances the AOT test harness to print the "actual" and "reference" values when there is a mismatch. This helps when debugging a failing test. Sample output:

Actual, Reference
8.502946, 8.887751
9.810405, 9.108611
8.563767, 9.041000
10.019511, 9.190888
....