fix corner case in conditionals (#5713)

fixes #5712

lib/compress.js

@@ -11809,7 +11809,7 @@ Compressor.prototype.compress = function(node) {
                     left: self.left.right,
                     right: self.right,
                 });
-                var after = before.optimize(compressor);
+                var after = before.transform(compressor);
                 if (before !== after) {
                     self.left = self.left.left;
                     self.right = after;

test/compress/conditionals.js

@@ -3051,3 +3051,20 @@ issue_5694: {
     }
     expect_stdout: "NaN"
 }
+
+issue_5712: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        evaluate: true,
+    }
+    input: {
+        var a = 0;
+        a || (++a).toString() && a && console.log("PASS");
+    }
+    expect: {
+        var a = 0;
+        a || (++a).toString() && a && console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}