speedup wf{3,4}_of_wf by factorizing raw matches to definitions #157
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This greatly reduces term size (tree size 1988106 -> 1121651 for wf3_of_wf).
Timings before:
(Time Succeed Qed includes some time which isn't in Time Qed, see also coq/coq#19426)
wf3
tactics 2.2s
qed 1.09s
succeed qed 1.25s
wf4
tactics 14.5s
qed 7.4s
succeed qed 8.5s
After:
wf3
tactics 1.4s
qed 0.6s
succeed qed 0.65s
wf4
tactics 8s
qed 3.6s
succeed qed 4s