Add samples for coerceAtLeast

#KT-20357

libraries/stdlib/samples/test/samples/comparisons/comparableOps.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package samples.comparisons
+
+import samples.*
+
+class ComparableOps {
+
+    @Sample
+    fun coerceAtLeast() {
+        assertPrints(10.coerceAtLeast(5), "10")
+        assertPrints(10.coerceAtLeast(20), "20")
+    }
+
+}