KT-9981 Code cleanup replace usages of !in incorrectly

#KT-9981 Fixed

idea/testData/quickfix/deprecatedSymbolUsage/operatorCalls/plusAssign.kt.after

@@ -0,0 +1,12 @@
+// "Replace with 'add(c)'" "true"
+class C
+
+@Deprecated("", ReplaceWith("add(c)"))
+operator fun C.plus(c: C) = C()
+
+fun C.add(c: C) = C()
+
+fun f() {
+    var c1 = C()
+    c1 = c1.add(C())
+}