Fix type of reference to protected var

#KT-12982 Fixed

compiler/testData/diagnostics/tests/callableReference/property/protectedVarFromClass.kt

@@ -0,0 +1,22 @@
+// KT-12982 Incorrect type inference when accessing mutable protected property via reflection
+
+import kotlin.reflect.KMutableProperty1
+
+class Foo {
+    protected var x = 0
+
+    fun baz(p: KMutableProperty1<Foo, Int>) = p
+    fun print() = baz(Foo::x)
+}
+
+
+open class A {
+    protected fun a() {}
+}
+
+open class B : A() {
+    val x = C::a
+    val y = C()::a
+}
+
+class C : B()