[libc++] Remove a bunch of now unnecessary indirections in __tree #142397
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Most notably, this removes the notion of a distinct
value_type
and__containter_value_type
from__tree
, since these are now always the same type. There are a few places we need to keep__value_type
around, since they are ABI visibile. In these cases_Tp
is used directly. The second simplification here is that we useconst value_type&
instead ofconst key_type&
in a few places and make use of the fact that the comparator is capable of comparing any combination ofkey_type
andvalue_type
.This is a follow-up to #134819.