complete nested calls for array set expression correctly

compiler/testData/diagnostics/tests/inference/nestedCalls/completeNestedCallsForArraySetExpression.kt

@@ -0,0 +1,8 @@
+fun foo<T>(t: T) = t
+
+fun test(map: MutableMap<Int, Int>, t: Int) {
+    map [t] = foo(t) // t was marked with black square
+}
+
+//from library
+fun <K, V> MutableMap<K, V>.set(key : K, value : V) : V<!BASE_WITH_NULLABLE_UPPER_BOUND!>?<!> = this.put(key, value)