mesa: Generate GL_INVALID_OPERATION when drawing w/o a VAO in core profile
mesa: Generate GL_INVALID_OPERATION when drawing w/o a VAO in core profile

GL 3-ish versions of the spec are less clear that an error should be
generated here, so Ken (and I during review) just missed it in 1afe335.

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler