Add missing TruffleBoundary

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/UnicodeDataModuleBuiltins.java

@@ -248,7 +248,7 @@ public Object name(int cp, Object defaultValue) {
                 // do not populate names from private use areas
                 throw raise(ValueError, ErrorMessages.NO_SUCH_NAME);
             }
-            String result = UCharacter.getName(cp);
+            String result = getName(cp);
             if (result == null) {
                 if (defaultValue == PNone.NO_VALUE) {
                     throw raise(ValueError, ErrorMessages.NO_SUCH_NAME);
@@ -258,6 +258,11 @@ public Object name(int cp, Object defaultValue) {
             return result;
         }
 
+        @TruffleBoundary
+        private static String getName(int cp) {
+            return UCharacter.getName(cp);
+        }
+
         @Override
         protected ArgumentClinicProvider getArgumentClinic() {
             return UnicodeDataModuleBuiltinsClinicProviders.NameNodeClinicProviderGen.INSTANCE;