Additional tests for KT-21131

idea/testData/quickfix/deprecatedSymbolUsage/properties/extensionPropertyWriteToProperty.kt

@@ -0,0 +1,16 @@
+// "Replace with 'm'" "true"
+
+private class C {
+    var m: String = ""
+}
+
+@Deprecated("", ReplaceWith("m"))
+private var C.old: String
+    get() = m
+    set(value) {
+        m = value
+    }
+
+private fun use(c: C, s: String) {
+    c.old<caret> = s
+}