Remove unnecessary field in AST node.  This saves a lookup during construction.
Remove unnecessary field in AST node.  This saves a lookup during construction.

hippich/typescript,fdecampredon/jsx-typescript-old-version,mbebenita/shumway.ts,mbrowne/typescript-dci,mbrowne/typescript-dci,popravich/typescript,fdecampredon/jsx-typescript-old-version,mbebenita/shumway.ts,mbrowne/typescript-dci,mbrowne/typescript-dci,hippich/typescript,popravich/typescript,hippich/typescript,mbebenita/shumway.ts,popravich/typescript,fdecampredon/jsx-typescript-old-version