ghc-7.10.1-rc1 build GC log messages

[Tuncer Ayaz]

Building ghc-7.10.1-rc1, I see the following new messages:

HC [stage 1] compiler/stage2/build/Dwarf.p_o
<<ghc: 607994600 bytes, 145 GCs, 14478288/51516200 avg/max bytes
residency (8 samples), 103M in use, 0.00 INIT (0.00 elapsed), 0.88 MUT
(1.10 elapsed), 0.76 GC (0.77 elapsed) :ghc>>

Is this a debug log or normal from now on during a ghc build?
I don't mind, but I just wanted to make sure it's not a mistakenly
enabled debug flag somewhere.