KT-2842 Function with declared non-null receiver resolves with nullable argument receiver

#KT-2842 fixed

compiler/testData/diagnostics/tests/inference/regressions/kt2842.kt

@@ -0,0 +1,27 @@
+package c
+
+trait A<T>
+
+fun test(a: A<Int>?) {
+    a<!UNSAFE_CALL!>.<!>foo() //no error
+}
+
+fun <R> A<R>.foo() {}
+
+//------------
+fun test(nullabilityInfoMap: Map<Int, Any>?) {
+    nullabilityInfoMap<!UNSAFE_CALL!>.<!>iterator() //no error
+}
+
+//resolves to
+public inline fun <K,V> Map<K,V>.iterator(): Iterator<Map.Entry<K,V>> {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+
+
+//-------------
+fun foo() : Boolean {
+    val nullableList = getNullableList()
+    return nullableList<!UNSAFE_CALL!>.<!>contains("")
+
+}
+
+fun getNullableList(): List<String>? = null