Enhance metrics output
@nakaji-dayo has done a great job in d7b2f799 enhancing the display of testsuite results. This patch makes exceptional results (significant increase/decrease or new result) even more visible.
ManyAlternatives(normal) ghc/alloc 817147688.0 874608960.0 +7.0% BAD
ManyConstructors(normal) ghc/alloc 4500303848.0 4866050040.0 +8.1% BAD
MethSharing(normal) run/alloc 480097840.0 480099032.0 +0.0%
MethSharing(normal) run/peak 2.0 2.0 +0.0%
MultiLayerModules(normal) ghc/alloc 6030250192.0 7346081088.0 +21.8% BAD
Naperian(optasm) ghc/alloc 59816696.0 75531472.0 +26.3% BAD
PmSeriesG(normal) ghc/alloc 55740168.0 74808504.0 +34.2% BAD
PmSeriesS(normal) ghc/alloc 69120912.0 88423640.0 +27.9% BAD
PmSeriesT(normal) ghc/alloc 103647184.0 122816240.0 +18.5% BAD
PmSeriesV(normal) ghc/alloc 68115384.0 87308160.0 +28.2% BAD
T10370(optasm) ghc/peak 95.0 90.0 -5.3% GOOD