[Cogl journal] use G_UNLIKLEY around runtime debugging conditions
[Cogl journal] use G_UNLIKLEY around runtime debugging conditions

May as well improve the branch prediction around runtime debugging code.

rkudiyarov/clutter_osx,GNOME/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,jigpu/clutter,collects/clutter,kerrickstaley/clutter-vala,nobled/clutter,ebassi/clutter,dlespiau/clutter,djdeath/clutter,Distrotech/clutter,heysion/clutter-clone,GNOME/clutter,djdeath/clutter-multithreaded,kerrickstaley/clutter-vala,GNOME/clutter,jigpu/clutter,collects/clutter,spatulasnout/clutter,djdeath/clutter,ebassi/clutter,Distrotech/clutter,ebassi/clutter,djdeath/clutter-multithreaded,Distrotech/clutter,rkudiyarov/clutter_osx,rkudiyarov/clutter_osx,spatulasnout/clutter,jigpu/clutter,heysion/clutter-clone,djdeath/clutter-multithreaded,dlespiau/clutter,djdeath/clutter-android,spatulasnout/clutter,ebassi/clutter,collects/clutter,djdeath/clutter-android,tardyp/clutter,djdeath/clutter,GNOME/clutter,djdeath/clutter,djdeath/clutter-multithreaded,dlespiau/clutter,ebassi/clutter,djdeath/clutter-android,rkudiyarov/clutter_osx,heysion/clutter-clone,Distrotech/clutter,jigpu/clutter,collects/clutter,tardyp/clutter,collects/clutter,tardyp/clutter,heysion/clutter-clone,djdeath/clutter,Distrotech/clutter,jigpu/clutter,heysion/clutter-clone,nobled/clutter,spatulasnout/clutter,djdeath/clutter-android,djdeath/clutter-android,jigpu/clutter,GNOME/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,nobled/clutter,djdeath/clutter