A couple perf tweaks

Author: jhy

src/main/java/org/jsoup/parser/CharacterReader.java

@@ -30,11 +30,11 @@ boolean isEmpty() {
     }
 
     char current() {
-        return isEmpty() ? EOF : input[pos];
+        return pos >= length ? EOF : input[pos];
     }
 
     char consume() {
-        char val = isEmpty() ? EOF : input[pos];
+        char val = pos >= length ? EOF : input[pos];
         pos++;
         return val;
     }

src/main/java/org/jsoup/parser/HtmlTreeBuilder.java

@@ -230,7 +230,8 @@ void insert(Token.Comment commentToken) {
     void insert(Token.Character characterToken) {
         Node node;
         // characters in script and style go in as datanodes, not text nodes
-        if (StringUtil.in(currentElement().tagName(), TagsScriptStyle))
+        String tagName = currentElement().tagName();
+        if (tagName.equals("script") || tagName.equals("style"))
             node = new DataNode(characterToken.getData(), baseUri);
         else
             node = new TextNode(characterToken.getData(), baseUri);

src/main/java/org/jsoup/parser/HtmlTreeBuilderState.java

@@ -252,7 +252,7 @@ boolean process(Token t, HtmlTreeBuilder tb) {
                         // todo confirm that check
                         tb.error(this);
                         return false;
-                    } else if (isWhitespace(c)) {
+                    } else if (tb.framesetOk() && isWhitespace(c)) { // don't check if whitespace if frames already closed
                         tb.reconstructFormattingElements();
                         tb.insert(c);
                     } else {