Prohibit callable references to object members

To be able to make them more useful in the future, i.e. bound to the object
instance

compiler/testData/codegen/boxWithStdlib/callableReference/function/memberImportedFromObject.kt

@@ -1,17 +0,0 @@
-import A.foo
-import A.bar
-
-object A {
-    fun foo() = "O"
-    fun String.foo() = "K"
-
-    @JvmStatic
-    fun bar(s: Int) = "OK"
-}
-
-fun box(): String {
-    val static = (::bar)(0)
-    if (static != "OK") return "1"
-
-    return (::foo)() + (String::foo)("")
-}

compiler/testData/codegen/boxWithStdlib/callableReference/function/objectMemberUnitNoArgs.kt

@@ -1,13 +0,0 @@
-object A {
-    var result = "Fail"
-    
-    fun foo() {
-        result = "OK"
-    }
-}
-
-fun box(): String {
-    val x = A::foo
-    x(A)
-    return A.result
-}

compiler/testData/codegen/boxWithStdlib/callableReference/function/objectMemberUnitOneStringArg.kt

@@ -1,13 +0,0 @@
-object A {
-    var result = "Fail"
-    
-    fun foo(newResult: String) {
-        result = newResult
-    }
-}
-
-fun box(): String {
-    val x = A::foo
-    x(A, "OK")
-    return A.result
-}