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
for (int i = 0; i < min; ++i) {
							
			TableItem item = items[i];
			if (item.getData() == null) 
				updateItem(item, children[i]);
		}
		
		for (int i = min; i < children.length; ++i) {
			createItem(children[i],i);
		}
	}
	/**
	 * Removes the given elements from this table viewer.
	 * 
	 * @param elements
	 *            the elements to remove
	 */
	private void internalRemove(final Object[] elements) {
		Object input = getInput();
		for (int i = 0; i < elements.length; ++i) {
			if (equals(elements[i], input)) {
				setInput(null);
				return;
			}
		}
		
		
		int[] indices = new int[elements.length];
		int count = 0;
		for (int i = 0; i < elements.length; ++i) {