Don't relax type when doing an instantiateL during subtyping #5133
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This is the case of
a < T
for some structuredT
. By relaxing, we are actually allowinga
to be a supertype ofT
as far as abilities go, which is not correct. Seems like it was just erroneously mirrored from the opposite case, whereT < a
means thata
could be more general thanT
.Fixes #5129 and #3513.