aco: delete aco_jump_threading.cpp

This is now handled by lower_branches().

Totals from 47236 (59.49% of 79395) affected shaders: (Navi31)
Instrs: 29490400 -> 29490507 (+0.00%)
CodeSize: 152316812 -> 152317248 (+0.00%); split: -0.00%, +0.00%
Latency: 229665459 -> 229665106 (-0.00%); split: -0.00%, +0.00%
InvThroughput: 36870605 -> 36870504 (-0.00%); split: -0.00%, +0.00%
Copies: 1966751 -> 2233467 (+13.56%)
SALU: 3122941 -> 3123048 (+0.00%)

Note, that only about 20 shaders are actually affected.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32477>

src/amd/compiler/aco_lower_branches.cpp

@@ -73,6 +73,7 @@ try_remove_simple_block(branch_ctx& ctx, Block& block)
          succ.linear_preds.push_back(pred_idx);
       } else {
          /* This block is the fall-through target of the predecessor. */
+         assert(pred_idx == block.index - 1);
          if (block.instructions.empty()) {
             /* If this block is empty, just fall-through to the successor. */
             pred.linear_succs[0] = succ_idx;