anv: Define macro anv_debug()
anv: Define macro anv_debug()

This is a printf-like macro that prints a debug message to stderr when
built with DEBUG.  If no DEBUG, then do nothing.

Reviewed-by: Jason Ekstranad <68c46a606457643eab92053c1c05574abb26f861@jlekstrand.net>
Reviewed-by: Lionel Landwerlin <9463032a5b99ffad10f36631678a833369a311b5@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler