[Sema] Solution nodeTypes from MapVector to DenseMap. #32365
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but Solution node->type map is all or nothing, so can be cheaper.
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gregomni
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ConstraintSystem node->type map requires ordering because it is a stack that can be partially undone, but Solution node->type map is all or nothing, so can be cheaper with just a DenseMap.
Impact is small, but this does save ~5% of the time in Sema for expressions with a whole lot of ASTNodes, such as array literals, e.g. https://bugs.swift.org/browse/SR-8314.