fix corner case in inline (#5853)

fixes #5851

Author: alexlamsl

lib/compress.js

@@ -10928,9 +10928,11 @@ Compressor.prototype.compress = function(node) {
                 && (value = can_flatten_body(stat))) {
                 var replacing = exp === fn || def.single_use && def.references.length - def.replaced == 1;
                 if (can_substitute_directly()) {
+                    self._optimized = true;
+                    var retValue = value.optimize(compressor).clone(true);
                     var args = self.args.slice();
                     var refs = [];
-                    var retValue = value.optimize(compressor).clone(true).transform(new TreeTransformer(function(node) {
+                    retValue = retValue.transform(new TreeTransformer(function(node) {
                         if (node instanceof AST_SymbolRef) {
                             var def = node.definition();
                             if (fn.variables.get(node.name) !== def) {

test/compress/functions.js

@@ -8917,3 +8917,57 @@ issue_5841_2: {
         "foo",
     ]
 }
+
+issue_5851_1: {
+    options = {
+        inline: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        console.log("PASS") && f();
+        function f() {
+            return f();
+        }
+        f;
+    }
+    expect: {
+        console.log("PASS") && f();
+        function f() {
+            return f();
+        }
+        f;
+    }
+    expect_stdout: "PASS"
+}
+
+issue_5851_2: {
+    options = {
+        conditionals: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = f();
+        f();
+        function f() {
+            if (console.log("foo"))
+                console && f();
+        }
+    }
+    expect: {
+        f();
+        f();
+        function f() {
+            console.log("foo") && console && f();
+        }
+    }
+    expect_stdout: [
+        "foo",
+        "foo",
+    ]
+}