[AST] Add the skeleton for PackExpansionExpr.
#61523
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This adds the AST node for
PackExpansionExpr. These nodes will later be created inpreCheckExprwhen the operand of...contains pack references. Another option is to resolve...in the constraint system via disjunctions by adding the pack expansion operator to the overload set with the postfix...operator, but I'm not yet sure whether that's necessary.The type of a
PackExpansionExprwill be aPackExpansionTypewhose pattern type is the type of the pattern expression. The pattern type containsSequenceArchetypes (to-be-renamed toPackArchetypeor similar) for each pack reference in the expression pattern.