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Joe Savona
5f2833bd5c
Refactors Codegen to extract the core "visit IR as a tree" logic separately from the code to emit JS: * `HIRTreeVisitor` is a new helper that visits the HIR as a tree. You call `visitTree(ir, yourVisitor)` and it drives visiting of the IR, tracking blocks and scopes and calling methods as appropriate. * `Codegen` is now implemented as a Visitor implementation. For example `enterBlock()` creates an empty `Array<t.Statement>`, `leaveBlock()` wraps that in a `t.BlockStatement`, etc. * `printHIRTree()` is a new IR printer (implemented as a visitor) that prints the HIR in tree form, so it retains the original shape of the code but with each block replaced with its IR equivalent.