KT-2752: prohibit JSName on extension properties

compiler/testData/diagnostics/testsWithJsStdLib/name/jsNameOnPropertyAndAccessor.kt

@@ -19,6 +19,3 @@ class A {
 @JsName("mm_") var mm: Int
     <!JS_NAME_ON_ACCESSOR_AND_PROPERTY!>@JsName("get_mm")<!> get() = 23
     <!JS_NAME_ON_ACCESSOR_AND_PROPERTY!>@JsName("set_mm")<!> set(value) {}
-
-@JsName("ext_") val A.ext: Int
-    <!JS_NAME_ON_ACCESSOR_AND_PROPERTY!>@JsName("get_ext")<!> get() = 23

compiler/testData/diagnostics/testsWithJsStdLib/name/jsNameOnPropertyAndAccessor.txt

@@ -4,7 +4,6 @@ package foo {
     @kotlin.js.JsName(name = "mm_") public var mm: kotlin.Int
     @kotlin.js.JsName(name = "xx_") public val xx: kotlin.Int
     @kotlin.js.JsName(name = "yy_") public val yy: kotlin.Int = 0
-    @kotlin.js.JsName(name = "ext_") public val foo.A.ext: kotlin.Int
 
     public final class A {
         public constructor A()

compiler/testData/diagnostics/testsWithJsStdLib/name/jsNameProhibitedOnExtensionProperty.kt

@@ -0,0 +1,9 @@
+package foo
+
+class A
+
+<!JS_NAME_PROHIBITED_FOR_EXTENSION_PROPERTY!>@JsName("xx")<!> val A.x: Int
+    get() = 23
+
+<!JS_NAME_PROHIBITED_FOR_EXTENSION_PROPERTY!>@property:JsName("yy")<!> val A.y: Int
+    get() = 42

compiler/testData/diagnostics/testsWithJsStdLib/name/jsNameProhibitedOnExtensionProperty.txt

@@ -0,0 +1,13 @@
+package
+
+package foo {
+    @kotlin.js.JsName(name = "xx") public val foo.A.x: kotlin.Int
+    @property:kotlin.js.JsName(name = "yy") public val foo.A.y: kotlin.Int
+
+    public final class A {
+        public constructor A()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}