Work around a bug observed with ATI graphics cards where instanced draw calls fail when all attributes are non-instanced, by repeating the draw call.

TRAC #19489
Signed-off-by: Daniel Koch
Author: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/trunk@974 736b8ea6-26fd-11df-bfd4-992fa37f6226