[FIR] Prefer the non-smartcasted receiver in resolution if it's visible

Previously, we would ignore the candidate with the non-smartcasted
receiver if they have the same symbol.
Now we prefer them when they're visible or when the smart cast changes
the nullability.

compiler/testData/diagnostics/tests/scopes/protectedVisibility/withSmartcast.fir.kt

@@ -27,4 +27,21 @@ class Derived : Base() {
             x.y = x.y + 1
         }
     }
+
+    protected fun baz2(x: Base?) {
+        x.<!INVISIBLE_REFERENCE!>foo<!>()
+        x.<!INVISIBLE_REFERENCE!>bar<!>()
+
+        x.<!INVISIBLE_REFERENCE!>x<!> = x.<!INVISIBLE_REFERENCE!>x<!> + 1
+        x.<!INVISIBLE_SETTER!>y<!> = x<!UNSAFE_CALL!>.<!>y + 1
+
+        if (x is Derived) {
+            x.foo()
+            x.bar()
+            x.baz(x)
+
+            x.x = x.x + 1
+            x.y = x.y + 1
+        }
+    }
 }

compiler/testData/diagnostics/tests/scopes/protectedVisibility/withSmartcast.kt

@@ -27,4 +27,21 @@ class Derived : Base() {
             <!INVISIBLE_SETTER!>x.y<!> = x.y + 1
         }
     }
+
+    protected fun baz2(x: Base?) {
+        x<!UNSAFE_CALL!>.<!><!INVISIBLE_MEMBER!>foo<!>()
+        x<!UNSAFE_CALL!>.<!><!INVISIBLE_MEMBER!>bar<!>()
+
+        x<!UNSAFE_CALL!>.<!><!INVISIBLE_MEMBER!>x<!> = x<!UNSAFE_CALL!>.<!><!INVISIBLE_MEMBER!>x<!> + 1
+        <!INVISIBLE_SETTER!>x<!UNSAFE_CALL!>.<!>y<!> = x<!UNSAFE_CALL!>.<!>y + 1
+
+        if (x is Derived) {
+            <!DEBUG_INFO_SMARTCAST!>x<!>.foo()
+            <!DEBUG_INFO_SMARTCAST!>x<!>.bar()
+            <!DEBUG_INFO_SMARTCAST!>x<!>.baz(<!DEBUG_INFO_SMARTCAST!>x<!>)
+
+            <!DEBUG_INFO_SMARTCAST!>x<!>.x = <!DEBUG_INFO_SMARTCAST!>x<!>.x + 1
+            <!DEBUG_INFO_SMARTCAST!>x<!>.y = <!DEBUG_INFO_SMARTCAST!>x<!>.y + 1
+        }
+    }
 }

compiler/testData/diagnostics/tests/scopes/protectedVisibility/withSmartcast.txt

@@ -1,24 +0,0 @@
-package
-
-public open class Base {
-    public constructor Base()
-    protected open var x: kotlin.Int
-    public open var y: kotlin.Int
-    protected open fun bar(): kotlin.Unit
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    protected open fun foo(): kotlin.Unit
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
-
-public final class Derived : Base {
-    public constructor Derived()
-    protected open override /*1*/ /*fake_override*/ var x: kotlin.Int
-    public open override /*1*/ /*fake_override*/ var y: kotlin.Int
-    protected open override /*1*/ fun bar(): kotlin.Unit
-    protected final fun baz(/*0*/ x: Base): kotlin.Unit
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    protected open override /*1*/ /*fake_override*/ fun foo(): kotlin.Unit
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}