Deprecate sumBy and sumByDouble with WARNING

libraries/stdlib/test/collections/IterableTests.kt

@@ -417,6 +417,7 @@ abstract class IterableTests<T : Iterable<String>>(val createFrom: (Array<out St
         expect(0) { empty.count { it.startsWith("x") } }
     }
 
+    @Suppress("DEPRECATION")
     @Test
     fun sumBy() {
         expect(6) { data.sumBy { it.length } }

libraries/stdlib/test/collections/UnsignedArraysTest.kt

@@ -327,6 +327,7 @@ class UnsignedArraysTest {
         assertEquals(3, ulongArrayOf(2u, 3u, 4u).count { it > 1uL })
     }
 
+    @Suppress("DEPRECATION")
     @Test
     fun sumBy() {
         assertEquals(3u, ubyteArrayOf(0, 1, 2).sumBy { it.toUInt() })
@@ -335,6 +336,7 @@ class UnsignedArraysTest {
         assertEquals(6u, ulongArrayOf(2, 3, 4).sumBy { (it - 1u).toUInt() })
     }
 
+    @Suppress("DEPRECATION")
     @Test
     fun sumByDouble() {
         assertEquals(3.0, ubyteArrayOf(0, 1, 2).sumByDouble { it.toDouble() })