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checkexpr: cache type of container literals when possible (#12707)
When a container (list, set, tuple, or dict) literal expression is used as an argument to an overloaded function it will get repeatedly typechecked. This becomes particularly problematic when the expression is somewhat large, as seen in #9427 To avoid repeated work, add a new cache in ExprChecker, mapping the AST node to the resolved type of the expression. Right now the cache is only used in the fast path, although it could conceivably be leveraged for the slow path as well in a follow-up commit. To further reduce duplicate work, when the fast-path doesn't work, we use the cache to make a note of that, to avoid repeatedly attempting to take the fast path. Fixes #9427
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