Add "Suspicious collection reassignment" inspection #KT-20626 Fixed

idea/testData/quickfix/suspiciousCollectionReassignment/replaceWithAssignment/notLocal.kt

@@ -0,0 +1,10 @@
+// "Replace with assignment" "false"
+// ACTION: Replace overloaded operator with function call
+// ACTION: Replace with ordinary assignment
+// WITH_RUNTIME
+class Test {
+    var list = emptyList<Int>()
+    fun test(otherList: List<Int>) {
+        list +=<caret> otherList
+    }
+}