add new compress option unsafe_methods for ecma >= 6 (#2325)

fixes #2321

test/compress/arrow.js

@@ -290,6 +290,7 @@ issue_2105_1: {
         passes: 3,
         reduce_vars: true,
         side_effects: true,
+        unsafe_methods: true,
         unused: true,
     }
     input: {

test/compress/object.js

@@ -516,6 +516,7 @@ variable_as_computed_property: {
 prop_func_to_concise_method: {
     options = {
         ecma: 6,
+        unsafe_methods: true,
     }
     input: {
         ({
@@ -544,6 +545,7 @@ prop_func_to_concise_method: {
 prop_arrow_to_concise_method: {
     options = {
         ecma: 6,
+        unsafe_methods: true,
     }
     input: {
         ({
@@ -592,6 +594,7 @@ concise_method_to_prop_arrow: {
 prop_func_to_async_concise_method: {
     options = {
         ecma: 8,
+        unsafe_methods: true,
     }
     input: {
         ({
@@ -614,6 +617,7 @@ prop_func_to_async_concise_method: {
 prop_func_to_concise_method_various: {
     options = {
         ecma: 6,
+        unsafe_methods: true,
     }
     input: {
         ({
@@ -646,6 +650,7 @@ prop_func_to_concise_method_various: {
 prop_arrows_to_concise_method_various: {
     options = {
         ecma: 6,
+        unsafe_methods: true,
     }
     input: {
         ({
@@ -674,6 +679,7 @@ prop_arrows_to_concise_method_various: {
 prop_arrow_with_this: {
     options = {
         ecma: 6,
+        unsafe_methods: true,
     }
     input: {
         function run(arg) {
@@ -711,6 +717,7 @@ prop_arrow_with_this: {
 prop_arrow_with_nested_this: {
     options = {
         ecma: 6,
+        unsafe_methods: true,
     }
     input: {
         function run(arg) {

test/compress/properties.js

@@ -887,6 +887,7 @@ methods_keep_quoted_true: {
     options = {
         arrows: true,
         ecma: 6,
+        unsafe_methods: true,
     }
     mangle = {
         properties: {
@@ -906,6 +907,7 @@ methods_keep_quoted_false: {
     options = {
         arrows: true,
         ecma: 6,
+        unsafe_methods: true,
     }
     mangle = {
         properties: {
@@ -931,6 +933,7 @@ methods_keep_quoted_from_dead_code: {
         evaluate: true,
         reduce_vars: true,
         side_effects: true,
+        unsafe_methods: true,
     }
     mangle = {
         properties: {
@@ -964,3 +967,35 @@ issue_2256: {
         g.keep = g.g;
     }
 }
+
+issue_2321: {
+    options = {
+        ecma: 6,
+        unsafe_methods: false,
+    }
+    input: {
+        var f = {
+            foo: function(){ console.log("foo") },
+            bar() { console.log("bar") }
+        };
+        var foo = new f.foo();
+        var bar =     f.bar();
+    }
+    expect: {
+        var f = {
+            foo: function() {
+                console.log("foo");
+            },
+            bar() {
+                console.log("bar");
+            }
+        };
+        var foo = new f.foo();
+        var bar = f.bar();
+    }
+    expect_stdout: [
+        "foo",
+        "bar",
+    ]
+    node_version: ">=6"
+}