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: cbad201c2b "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>

src/compiler/nir/nir.h

@@ -2463,6 +2463,7 @@ typedef enum {
    nir_lower_minmax64 = (1 << 10),
    nir_lower_shift64 = (1 << 11),
    nir_lower_imul_2x32_64 = (1 << 12),
+   nir_lower_extract64 = (1 << 13),
 } nir_lower_int64_options;
 
 typedef enum {