r600g: Fix assert in tgsi_cmp
r600g: Fix assert in tgsi_cmp

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=91726

Signed-off-by: Glenn Kennard <feea5431f8695a3af7470d472cb16ac8e02bab01@gmail.com>
Cc: "11.0" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler