We can remove the old reporting if people are OK with that.
The old reporting has a bug that it reports 0->N changes as 0 % in several
places. (should be inf %)

The new reporting shows:
- VGPR spilling shaders and apps (from the second file only)
- the same for SGPRs
- worst regressions (from the comparison of both files)
- percentage deltas at the end
.. and colors!!!

Example:

 WORST VGPR SPILLS (not deltas)                                        VGPRs SpillVGPR ScratchVGPR
 shaders/private/f1-2015/18.shader_test [0]                               32         0       516
 shaders/private/bioshock-infinite/256.shader_test [0]                    64       176       180
 shaders/private/ue4_lightroom_interior_day/42.shader_test [0]            28         0        76
 shaders/private/dirt-showdown/676.shader_test [0]                        68        49        72
 shaders/private/f1-2015/1102.shader_test [0]                             52         0  ...