Hamish Knight a97328dcbf [CS] Use a MapVector to cache resolved overloads ...

Rather than maintaining a linked list of overload
choices, which must be linearly searched each time
we need to lookup an overload at a given callee
locator, use a MapVector which can be rolled back
at the end of a scope.

Remove ResolvedOverloadSetListItem in favor of
using SelectedOverload, which avoids the need to
convert between them when moving from
ConstraintSystem to Solution.

2019-12-05 14:47:52 -08:00

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