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We currently keep two separate pieces of state regarding the current loop on `SemanticIndexBuilder`. One is an enum simply reflecting whether we are currently inside a loop, and the other is the saved flow states for `break` statements found in the current loop. For adding loopy control flow, I'll need to add some additional loop state (`continue` states, for example). Prepare for this by consolidating our existing loop state into a single struct and simplifying the API for pushing and popping a loop. This is purely a refactor, so tests are not changed. --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>