fix: mark Map is impure

src/ast/nodes/shared/knownGlobals.ts

@@ -164,7 +164,7 @@ const knownGlobals: GlobalDescription = {
 	isNaN: PF,
 	isPrototypeOf: O,
 	JSON: O,
-	Map: PC,
+	Map: C,
 	Math: {
 		__proto__: null,
 		[ValueProperties]: IMPURE,

test/function/samples/tree-shake-map-constructor/_config.js

@@ -0,0 +1,4 @@
+module.exports = {
+	description:
+		'Retain the Map constructor is called with the new keyword if the accepted param has side effects'
+};

test/function/samples/tree-shake-map-constructor/main.js

@@ -0,0 +1,12 @@
+assert.ok(
+	new Map({
+		[Symbol.iterator]() {
+			return {
+				next() {
+					console.log('side effect');
+					return { done: true };
+				}
+			};
+		}
+	})
+);