Hash-cons the statically allocated Rels (1 to 16) to themselves
Hash-cons the statically allocated Rels (1 to 16) to themselves

 This is just a minor detail, but if we take care to use in mkRel
 always the same physical Rels for n <= 16, then let's ensure that
 these Rels are preserved by hash-consing. This way, we avoid
 killing some sharing during hash-consing of most of constr but not
 all (for instance those in mind).

 In fact, this is probably superfluous since earlier commit
 about "| Rel n as t -> t", but let's be sure.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@14542 85f007b7-540e-0410-9357-904b9bb8a0f7

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