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fc8a6fc9d0
This is the first step in decoupling the Painless AST from the grammar. The Painless AST should be able to generate classes independently of how the AST is generated from a grammar. (If I were to build a Painless AST by hand in code this should be all that's necessary.) This change removes Lambda name generation from the ANTLR grammar tree walker. It also removes unnecessary node generation of new array function references from the tree walker as well.