i965/eu: set execution size for SEND message in brw_send_indirect_message
i965/eu: set execution size for SEND message in brw_send_indirect_message

Reviewed-by: Topi Pohjolainen <749697f19798b7f640b17221fd283b903825f071@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler