Revert "intel/fs: Use ra_alloc_contig_reg_class() to speed up RA."
This reverts commit 40e1d798.
This causes major regressions on gen4/5 across the board, lots of piglits failing. Revert first, ask questions later.
This reverts commit 40e1d798.
This causes major regressions on gen4/5 across the board, lots of piglits failing. Revert first, ask questions later.