i965/fs: fix regs_written in LOAD_PAYLOAD for doubles
i965/fs: fix regs_written in LOAD_PAYLOAD for doubles

v2: Account for the stride of the dst (Iago)

Signed-off-by: Iago Toral Quiroga <a847aabaac44184372f6b1cd1a59aa254daaeb0b@igalia.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler