KT-7597 ErrorType leaked into backend

#KT-7597 Fixed

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

@@ -0,0 +1,10 @@
+// !CHECK_TYPE
+
+trait Inv<I>
+
+fun <S, T: S> Inv<T>.reduce2(): S = null!!
+
+fun test(a: Inv<Int>): Int {
+    val b = 1 <!OVERLOAD_RESOLUTION_AMBIGUITY!>+<!> a.reduce2()
+    return <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>b<!>
+}