fix: functions in global_defs may be compressed mistakenly (#1036)

* fix: functions in global_defs may be compressed mistakenly

* fix: use node.clone instead of re-parsing

lib/compress/inference.js

@@ -688,7 +688,15 @@ export function is_lhs(node, parent) {
 
 (function(def_find_defs) {
     function to_node(value, orig) {
-        if (value instanceof AST_Node) return make_node(value.CTOR, orig, value);
+        if (value instanceof AST_Node) {
+            if (!(value instanceof AST_Constant)) {
+                // Value may be a function, an array including functions and even a complex assign / block expression,
+                // so it should never be shared in different places.
+                // Otherwise wrong information may be used in the compression phase
+                value = value.clone(true);
+            }
+            return make_node(value.CTOR, orig, value);
+        }
         if (Array.isArray(value)) return make_node(AST_Array, orig, {
             elements: value.map(function(value) {
                 return to_node(value, orig);