i965/fs: indirect addressing with doubles is not supported in CHV/BSW/BXT

i965/fs: indirect addressing with doubles is not supported in CHV/BSW/BXT

From the Cherryview's PRM, Volume 7, 3D Media GPGPU Engine, Register Region
Restrictions, page 844:

  "When source or destination datatype is 64b or operation is integer DWord
   multiply, indirect addressing must not be used."

v2:
- Fix it for Broxton too.

v3:
- Simplify code by using subscript() and not creating a new num_components
variable (Kenneth).

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95462
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>