Bug 89971 [Viewers] Viewers that use IViewerLabelProvider do too many instanceof checks
M6 Checking our viewer the calls to buildLabel are doing too many instanceof checks. As a result certain viewers (such as the table viewer) are twice as slow as they were in 3.0 due to these checks. I have written some performance suites to test the Table, Tree, List and Combo viewers. Table and Tree have this issue.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
}
	/**
	 * Refresh all of the elements of the table. update the
	 * labels if updatLabels is true;
	 * @param updateLabels
	 * 
	 * @since 3.1
	 */
	private void internalRefreshAll(boolean updateLabels) {
		
		
		
		
		
		
		
		Object[] children = getSortedChildren(getRoot());
		TableItem[] items = getTable().getItems();
		int min = Math.min(children.length, items.length);
		for (int i = 0; i < min; ++i) {
			
			
			TableItem item = items[i];
				
			
			if (equals(children[i], item.getData())) {
				if (updateLabels) {
					updateItem(item, children[i]);
				} else {