fix join_vars on property accessors (#2895)

fixes #2893

lib/compress.js

@@ -1816,11 +1816,12 @@ merge(Compressor.prototype, {
                 }
                 if (prop instanceof AST_Node) break;
                 prop = "" + prop;
-                if (compressor.has_directive("use strict")) {
+                var diff = compressor.has_directive("use strict") ? function(node) {
-                    if (!all(def.value.properties, function(node) {
+                    return node.key != prop && node.key.name != prop;
-                        return node.key != prop && node.key.name != prop;
+                } : function(node) {
-                    })) break;
+                    return node.key.name != prop;
-                }
+                };
+                if (!all(def.value.properties, diff)) break;
                 def.value.properties.push(make_node(AST_ObjectKeyVal, node, {
                     key: prop,
                     value: node.right

test/compress/properties.js

@@ -1588,3 +1588,55 @@ issue_2816: {
     }
     expect_stdout: "3 2 4"
 }
+
+issue_2893_1: {
+    options = {
+        join_vars: true,
+    }
+    input: {
+        var o = {
+            get a() {
+                return "PASS";
+            },
+        };
+        o.a = "FAIL";
+        console.log(o.a);
+    }
+    expect: {
+        var o = {
+            get a() {
+                return "PASS";
+            },
+        };
+        o.a = "FAIL";
+        console.log(o.a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2893_2: {
+    options = {
+        join_vars: true,
+    }
+    input: {
+        var o = {
+            set a(v) {
+                this.b = v;
+            },
+            b: "FAIL",
+        };
+        o.a = "PASS";
+        console.log(o.b);
+    }
+    expect: {
+        var o = {
+            set a(v) {
+                this.b = v;
+            },
+            b: "FAIL",
+        };
+        o.a = "PASS";
+        console.log(o.b);
+    }
+    expect_stdout: "PASS"
+}