KT-2752: add checkers for inconsistent usage of JsName

js/js.translator/testData/box/nameClashes/extensionPropertiesWithDifferentReceivers.kt

@@ -0,0 +1,18 @@
+package foo
+
+class A
+
+class B
+
+val A.foo: Int
+    get() = 32
+
+val B.foo: Int
+    get() = 42
+
+fun box(): String {
+    assertEquals(32, A().foo)
+    assertEquals(42, B().foo)
+
+    return "OK"
+}