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aco: Improve WQM when using SCC

Timur Kristóf requested to merge Venemo/mesa:aco-scc-wqm into master

Add some code to the optimizer which helps guide the register allocator to make fewer copies of the SCC.

fossil db results on Navi 10:

 PERCENTAGE DELTAS                Shaders  SGPRs    CodeSize Instrs   Cycles   VMEM     SMEM     SClause  Copies   Branches 
 assassins_creed_origins          2104        .        .        .        .        .        .        .        .        .     
 battlefront2                     4568        .        .        .        .        .        .        .        .        .     
 britannia                        465         .        .        .        .        .        .        .        .        .     
 dark_souls_1_remastered          4249        .     -0.00%   -0.01%   -0.00%      .        .        .     -0.09%      .     
 dark_souls_2_sotfs               6876        .        .        .        .        .        .        .        .        .     
 dark_souls_3                     8912        .     +0.00%   +0.00%   +0.00%   +0.01%      .        .     +0.01%      .     
 death_stranding                  1467        .     -0.04%   -0.05%   -0.05%   -0.00%      .        .     -0.63%      .     
 detroit_become_human             19959       .     -0.13%   -0.17%   -1.17%   -0.03%   -0.00%   +0.00%   -1.81%   +0.03%   
 deus_ex_md                       8063        .     -0.00%   -0.00%   -0.00%      .        .        .     -0.01%      .     
 dirt4                            4030        .        .        .        .        .        .        .        .        .     
 doom_2016                        2963        .        .        .        .        .        .        .        .        .     
 doom_eternal                     1211     -0.04%   -0.23%   -0.29%   -0.44%   -0.01%   +0.02%      .     -2.82%      .     
 dota2                            1015        .        .        .        .        .        .        .        .        .     
 dow3                             280         .     -0.01%   -0.01%   -0.01%      .        .        .     -0.10%      .     
 evilwithin_demo                  740         .        .        .        .        .        .        .        .        .     
 f12017                           5503        .        .        .        .        .        .        .        .        .     
 gtav                             2987        .     -0.00%   -0.00%   -0.00%      .     -0.00%      .     -0.07%      .     
 hitman                           2785        .     -0.00%   -0.00%   -0.00%      .        .        .     -0.01%      .     
 madmax                           948         .        .        .        .        .        .        .        .        .     
 nier                             5492        .     +0.00%   +0.00%   +0.00%      .        .        .     +0.00%      .     
 parallel-rdp/small_subgroup      246         .        .        .        .        .        .        .        .        .     
 parallel-rdp/small_uber_subgroup 55          .        .        .        .        .        .        .        .        .     
 parallel-rdp/subgroup            327         .        .        .        .        .        .        .        .        .     
 parallel-rdp/uber_subgroup       55          .        .        .        .        .        .        .        .        .     
 rdr2                             3888     -0.00%   -0.01%   -0.01%   -0.01%   +0.00%      .     -0.01%   -0.13%      .     
 redout                           2509        .     -0.00%   -0.00%   -0.00%      .        .        .     -0.01%      .     
 rottr                            8120        .        .        .        .     +0.00%      .        .        .        .     
 sottr_demo                       5705        .     -0.00%   -0.00%   -0.00%   +0.00%      .        .     -0.00%      .     
 strange_brigade                  1417     -0.11%   -0.09%   -0.12%   -0.12%   -0.03%      .        .     -1.54%      .     
 talos                            794         .        .        .        .        .        .        .        .        .     
 thewitness                       3150        .        .        .        .        .        .        .        .        .     
 threekingdoms                    844         .        .        .        .        .        .        .        .        .     
 tomb_raider                      16230       .        .        .        .        .        .        .        .        .     
 warhammer2                       1803        .        .        .        .        .        .        .        .        .     
 wolfenstein2_fp16                1012        .     -0.06%   -0.07%   -0.13%      .        .        .     -0.88%   +0.07%   
 worldofwarships                  5590        .        .        .        .        .        .        .        .        .     
 youngblood                       843         .     -0.03%   -0.03%   -0.06%      .        .        .     -0.40%      .     
 youngblood_fp16                  682         .     -0.07%   -0.08%   -0.14%   -0.00%      .        .     -1.00%   +0.15%   
 ----------------------------------------------------------------------------------------------------------------------------
 All affected                     7658     -0.01%   -0.17%   -0.21%   -1.17%   -0.16%   -0.00%   -0.00%   -2.22%   +0.04%   
 ----------------------------------------------------------------------------------------------------------------------------
 Total                            137887   -0.00%   -0.04%   -0.05%   -0.95%   -0.00%   -0.00%   -0.00%   -0.72%   +0.02%

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