aco: add new post-RA scheduler for ILP

This MR is another attempt for a post-RA scheduler. Marked as draft as I'm not yet fully satisfied with the runtime. It is based on the assumption that the pre-RA scheduler already does a well-enough job, so that we keep it very conservative.

 * This pass implements a simple forward list-scheduler which works on a small
 * partial DAG of 16 nodes at any time. Only ALU instructions are scheduled
 * entirely freely. Memory load instructions must be kept in-order and any other
 * instruction must not be re-scheduled at all.
 *
 * The main goal of this scheduler is to create more memory clauses, schedule
 * memory loads early, and to improve ALU instruction level parallelism.

Totals:
Instrs: 44411469 -> 43282833 (-2.54%); split: -2.58%, +0.03%
CodeSize: 227982124 -> 223462960 (-1.98%); split: -2.01%, +0.03%
Latency: 310302440 -> 299310411 (-3.54%); split: -3.64%, +0.10%
InvThroughput: 50597558 -> 49697625 (-1.78%); split: -1.79%, +0.01%
VClause: 870322 -> 834512 (-4.11%); split: -4.12%, +0.00%
SClause: 1484845 -> 1336256 (-10.01%); split: -10.01%, +0.00%

Totals from 77188 (97.30% of 79330) affected shaders:
Instrs: 44390015 -> 43261379 (-2.54%); split: -2.58%, +0.03%
CodeSize: 227864516 -> 223345352 (-1.98%); split: -2.01%, +0.03%
Latency: 310053227 -> 299061198 (-3.55%); split: -3.64%, +0.10%
InvThroughput: 50481049 -> 49581116 (-1.78%); split: -1.80%, +0.01%
VClause: 869359 -> 833549 (-4.12%); split: -4.12%, +0.00%
SClause: 1483982 -> 1335393 (-10.01%); split: -10.02%, +0.00%

 PERCENTAGE DELTAS                   Shaders   Instrs   CodeSize  Latency  InvThroughput  VClause   SClause  
 assassins_creed_valhalla            830       -2.38%    -1.85%    -3.28%      -1.37%      -4.77%   -10.38%  
 control                             4276      -2.39%    -1.90%    -3.59%      -1.39%      -8.78%   -16.91%  
 cyberpunk_2077                      2090      -3.09%    -2.43%    -4.62%      -3.61%      -2.52%    -7.18%  
 dead_space                          400       -2.96%    -2.44%    -2.41%      -2.08%      -2.30%   -23.52%  
 deathloop                           1134      -3.44%    -2.77%    -5.61%      -5.50%      -8.07%   -21.10%  
 detroit_become_human                995       -2.06%    -1.61%    -2.27%      -0.58%      -0.18%    -8.99%  
 deus_ex_md                          8063      -1.59%    -1.24%    -1.23%      -0.26%      -1.74%   -12.13%  
 doom_eternal                        468       -1.93%    -1.55%    -1.67%      -1.64%      -8.81%    -6.85%  
 dota2                               3840      -3.44%    -2.78%    -3.06%      -0.04%      -5.49%    -8.92%  
 dow3                                280       -2.46%    -1.84%    -2.50%      -0.39%      -3.29%    -2.13%  
 dredge                              2517      -2.69%    -2.02%    -2.58%      -0.01%      -0.51%   -12.22%  
 elden_ring                          3733      -3.27%    -2.61%    -4.73%      -1.94%      -7.11%    -8.40%  
 f1_23                               4006      -2.71%    -2.12%    -3.66%      -1.13%      -1.66%    -8.05%  
 farcry5                             805       -2.36%    -1.84%    -3.29%      -2.18%      -4.19%   -10.93%  
 god_of_war                          1029      -2.89%    -2.25%    -3.45%      -2.07%      -4.87%    -8.88%  
 gtav                                2955      -2.22%    -1.70%    -3.46%      -0.45%      -3.63%    -7.84%  
 heaven_d3d9_strict_float_ultra_4xaa 286       -3.71%    -2.81%    -5.56%      -0.17%      -4.46%   -20.60%  
 hogwarts_legacy                     887       -1.82%    -1.40%    -3.02%      -0.87%      -3.12%   -10.68%  
 horizon_zero_dawn                   1800      -3.41%    -2.62%    -4.64%      -0.51%      -7.15%    -7.39%  
 madmax                              922       -1.76%    -1.34%    -2.50%      -0.12%      -2.35%    -5.28%  
 metro_exodus                        2627      -4.05%    -3.09%    -7.34%      -0.94%      -2.66%   -19.29%  
 PERCENTAGE DELTAS                   Shaders   Instrs   CodeSize  Latency  InvThroughput  VClause   SClause  
 monster_hunter_world                1103      -1.88%    -1.49%    -2.94%      -0.61%      -2.67%   -19.58%  
 nier                                2422      -3.08%    -2.37%    -2.84%      -0.55%      -3.50%   -10.62%  
 no_mans_sky                         1978      -3.25%    -2.50%    -6.21%      -0.07%      -0.48%    -8.68%  
 parallel_rdp                        539       -3.16%    -2.38%    -2.61%      -2.82%      -9.15%    -4.59%  
 persona_5                           1566      -3.37%    -2.63%    -5.68%      -0.16%      -0.11%    -7.71%  
 q2rtx                               69        -1.63%    -1.25%    -2.36%      -0.86%      -0.45%    -4.59%  
 rdr2                                3649      -2.08%    -1.65%    -2.56%      -0.57%      -3.36%    -6.20%  
 redout                              2485      -2.65%    -2.04%    -5.69%      -0.17%      -2.70%    -8.77%  
 resident_evil_village               1157      -2.13%    -1.66%    -2.76%      -0.54%      -1.63%   -18.46%  
 second_extinction                   437       -2.14%    -1.57%    -3.93%      -3.47%      -3.13%    -9.45%  
 skyrim_dx9                          3305      -3.65%    -2.89%    -6.51%      -0.15%      -2.17%   -13.07%  
 sniper_elite_5                      4278      -1.06%    -0.80%    -2.89%      -1.76%      -2.76%    -9.62%  
 sottr                               542       -2.09%    -1.65%    -1.69%      -1.17%      -1.48%    -3.59%  
 spiderman_remastered                648       -2.35%    -1.82%    -2.99%      -2.95%      -2.70%    -9.63%  
 talos_principle                     1999      -2.63%    -1.99%    -5.45%      -0.00%      -0.90%   -18.37%  
 the_last_of_us_part1                1198      -1.73%    -1.41%    -3.20%      -1.63%      -1.72%    -8.86%  
 thewitness                          3150      -3.14%    -2.45%    -3.06%      -0.03%      -2.06%    -3.60%  
 total_warhammer_3                   632       -2.72%    -2.14%    -4.11%      -0.79%     -10.99%    -7.53%  
 war_thunder                         2100      -2.61%    -2.00%    -3.37%      -0.56%      -2.43%    -7.19%  
 worldofwarships                     2130      -2.70%    -2.02%    -3.07%      -0.10%      -2.00%    -8.56%  
 -------------------------------------------------------------------------------------------------------------
 All affected                        77188     -2.54%    -1.98%    -3.55%      -1.78%      -4.12%   -10.01%  
 -------------------------------------------------------------------------------------------------------------
 Total                               79330     -2.54%    -1.98%    -3.54%      -1.78%      -4.11%   -10.01%