i965: Don't hardcode FS in "validation failed!" message.
i965: Don't hardcode FS in "validation failed!" message.

Instead, print "Scalar VS" or "Scalar FS".  Otherwise it's really
confusing which stage is broken.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler