(classify-invoke {:keys [op args tag env form], :as ast})
If the AST node is an :invoke, check the node in function position,
* if it is a keyword, transform the node in a :keyword-invoke node;
* if it is the clojure.core/instance? var and the first argument is a
literal class, transform the node in a :instance? node to be inlined by
the emitter
* if it is a protocol function var, transform the node in a :protocol-invoke
node
* if it is a regular function with primitive type hints that match a
clojure.lang.IFn$[primitive interface], transform the node in a :prim-invoke
node