nir,intel: Add support for lowering 64-bit nir_opt_extract_*

We need this when doing full software 64-bit emulation.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110309


Fixes: cbad201c "nir/algebraic: Add missing 64-bit extract_[iu]8..."
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
(cherry picked from commit 0ba508d7)