NH-4043 - Union keywords in array instead of lots of adds.

Author: ngbrown

src/NHibernate/Dialect/Dialect.cs

@@ -2246,6 +2246,11 @@ protected void RegisterKeyword(string word)
 			Keywords.Add(word);
 		}
 
+		protected void RegisterKeywords(params string[] keywords)
+		{
+			Keywords.UnionWith(keywords);
+		}
+
 		protected void RegisterFunction(string name, ISQLFunction function)
 		{
 			_sqlFunctions[name] = function;