Deprecate ref... methods in MethodHandleInfo

These methods were mistakenly exposed as part of the public API in
Android 26. They do not appear to be used by any apps so this is a
prelude to removing them from the API completely.

Bug: 114175595
Test: make checkbuild
Change-Id: I17b7369a4fbb568bde5285d705d9194ac91e576d
diff --git a/api/current.txt b/api/current.txt
index 16274a9..b81e673 100755
--- a/api/current.txt
+++ b/api/current.txt
@@ -58485,9 +58485,9 @@
     method public String getName();
     method public int getReferenceKind();
     method public default boolean isVarArgs();
-    method public static boolean refKindIsField(int);
-    method public static boolean refKindIsValid(int);
-    method public static String refKindName(int);
+    method @Deprecated public static boolean refKindIsField(int);
+    method @Deprecated public static boolean refKindIsValid(int);
+    method @Deprecated public static String refKindName(int);
     method public static String referenceKindToString(int);
     method public <T extends java.lang.reflect.Member> T reflectAs(Class<T>, java.lang.invoke.MethodHandles.Lookup);
     method public static String toString(int, Class<?>, String, java.lang.invoke.MethodType);