KT-7597 ErrorType leaked into backend

#KT-7597 Fixed

compiler/testData/diagnostics/tests/resolve/nestedCalls/kt7597.txt

@@ -0,0 +1,10 @@
+package
+
+internal fun test(/*0*/ a: Inv<kotlin.Int>): kotlin.Int
+internal fun </*0*/ S, /*1*/ T : S> Inv<T>.reduce2(): S
+
+internal trait Inv</*0*/ I> {
+    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
+}