Add test for quoted constructors

Author: andrewbranch

tests/cases/conformance/classes/constructorDeclarations/quotedConstructors.ts

@@ -0,0 +1,23 @@
+class C {
+    x: number;
+    "constructor"() {
+        this.x = 0;
+    }
+}
+(new C).constructor(); // Error
+
+class D {
+    x: number;
+    'constructor'() {
+        this.x = 0;
+    }
+}
+(new C).constructor(); // Error
+
+class E {
+    x: number;
+    ['constructor']() {
+        this.x = 0;
+    }
+}
+(new E).constructor();