i965: Determine size of double precision float register
i965: Determine size of double precision float register

This is used to determine how many registers an instruction reads and
writes as well as for offseting register region into a desired component.

v2 (Connor): rebase on master

Signed-off-by: Topi Pohjolainen <749697f19798b7f640b17221fd283b903825f071@intel.com>
Signed-off-by: Tapani P\344lli <cdcb67a5e49297de94340ca09f25994bd5e7f762@intel.com>
Signed-off-by: Abdiel Janulgue <b6177409facd0a1ebaf54f9c29b28b2642b3c468@linux.intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Reviewed-by: Francisco Jerez <5906ff32bdd9fd8db196f6ba5ad3afd6f9257ea5@riseup.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler