protected & internal are now forbidden in interfaces

compiler/testData/diagnostics/tests/modifiers/internalInInterface.kt

@@ -0,0 +1,7 @@
+interface My {
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>internal<!> val x: Int
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>internal<!> val xxx: Int
+        get() = 0
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>internal<!> fun foo(): Int
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>internal<!> fun bar() = 42
+}

compiler/testData/diagnostics/tests/modifiers/internalInInterface.txt

@@ -0,0 +1,11 @@
+package
+
+public interface My {
+    internal abstract val x: kotlin.Int
+    internal open val xxx: kotlin.Int
+    internal open fun bar(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    internal abstract fun foo(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/modifiers/protected.kt

@@ -17,5 +17,5 @@ enum class Our(protected val x: Int) {
 }
 
 interface Their {
-    <!DEPRECATED_MODIFIER_CONTAINING_DECLARATION!>protected<!> fun foo() = 7
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>protected<!> fun foo() = 7
 }