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/TreeViewer.java
*/
		public TreeColorAndFontCollector() {
		}
		/**
		 * Set the fonts and colors for the treeItem if there is a color and
		 * font provider available.
		 * 
		 * @param treeItem
		 *            The item to update.
		 * @param element
		 *            The element being represented
		 * @param column
		 *            The column index
		 */
		public void setFontsAndColors(TreeItem treeItem, Object element,
				int column) {
			if (colorProvider != null) {
				treeItem.setBackground(column, colorProvider.getBackground(
						element, column));
				treeItem.setForeground(column, colorProvider.getForeground(
						element, column));
			}
			if (fontProvider != null)
				treeItem.setFont(column, fontProvider.getFont(element, column));
		}
	}
	/**
	 * Internal tree viewer implementation.
	 */
	private TreeEditorImpl treeViewerImpl;