javac ast indices: do not show "IOException" in messages when index was rebuilt due to new version

jps/jps-builders/src/org/jetbrains/jps/backwardRefs/BackwardReferenceIndexWriter.java

@@ -96,7 +96,7 @@ public class BackwardReferenceIndexWriter {
         CompilerBackwardReferenceIndex.removeIndexFiles(buildDir);
       }
       else if (CompilerBackwardReferenceIndex.versionDiffers(buildDir)) {
-        throw new BuildDataCorruptedException(new IOException("backward reference index should be updated to actual version"));
+        throw new BuildDataCorruptedException("backward reference index should be updated to actual version");
       }
 
       if (CompilerBackwardReferenceIndex.exist(buildDir) || isRebuild) {

jps/jps-builders/src/org/jetbrains/jps/builders/storage/BuildDataCorruptedException.java

@@ -28,6 +28,10 @@ public class BuildDataCorruptedException extends RuntimeException {
     super(cause);
   }
 
+  public BuildDataCorruptedException(String message) {
+    super(message);
+  }
+
   @Override
   public synchronized IOException getCause() {
     return (IOException)super.getCause();