i965: Don't print line numbers with INTEL_DEBUG=optimizer.
i965: Don't print line numbers with INTEL_DEBUG=optimizer.

The thing you want to do with the output files is diff them, which is
made more difficult by line numbers changing.

Reviewed-by: Alejandro Piñeiro <5dfedca1889afcca58e9b95acd46f78f54f166ed@igalia.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler