improve performance (#3020)

- replace `find_if()` with `all()` wherever possible
- move ESTree-specific logic out of `figure_out_scope()`

lib/compress.js

@@ -3525,8 +3525,9 @@ merge(Compressor.prototype, {
                 var defs = [];
                 vars.each(function(def, name){
                     if (self instanceof AST_Lambda
-                        && find_if(function(x){ return x.name == def.name.name },
-                                   self.argnames)) {
+                        && !all(self.argnames, function(argname) {
+                            return argname.name != name;
+                        })) {
                         vars.del(name);
                     } else {
                         def = def.clone();