Univ: a better Constraint.compare
Univ: a better Constraint.compare

Let's gain a few % by not using Pervasive.compare on a structure containing
some universe_levels, but rather UniverseLevel.compare on them.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15012 85f007b7-540e-0410-9357-904b9bb8a0f7

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