Add support for large line number tables.

Author: aardvark179

rhino/src/main/java/org/mozilla/javascript/interpreterv2/CompilerData.java

@@ -113,7 +113,7 @@ public int getFirstLineNumber() {
         return LineNumberTable.getFirstLineNumber(lineNumberTable);
     }
 
-    public short getPcFirstLineNumber() {
+    public int getPcFirstLineNumber() {
         return LineNumberTable.getPcFirstLineNumber(lineNumberTable);
     }