through completion phase result type of call should be updated

with respect to being selector in safe call expression

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

@@ -0,0 +1,39 @@
+package a
+
+trait A {
+    val b: B
+    val nb: B?
+}
+
+trait B {
+    fun foo(): Int
+}
+
+fun test(u: A?, x: A?, y: A?, z: A?, w: A, v: A?) {
+    u?.b?.foo()!! // was UNNECESSARY_SAFE_CALL everywhere, because result type (of 'foo()') wasn't made nullable
+    u!!.b<!UNNECESSARY_SAFE_CALL!>?.<!>foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    x?.b!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    x!!.b<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+
+    y?.nb?.foo()!!
+    y!!.nb?.foo()!!
+    z?.nb!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    z!!.nb!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+
+    w.b<!UNNECESSARY_SAFE_CALL!>?.<!>foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    w.b<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    w.nb?.foo()!!
+    w.nb!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+
+    v!!.b.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+}
+
+fun B?.bar(): Int = 1
+fun B?.baz(): Int? = 1
+
+fun doInt(i: Int) = i
+
+fun test(a: A?) {
+    doInt(a?.b.bar()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>)
+    doInt(a?.b.baz()!!)
+}