aco: insert p_end_wqm before p_jump_to_epilog

Otherwise, we can transition to exact before p_jump_to_epilog, then
transition to WQM again and then back to exact:
p_jump_to_epilog //transitions to exact
p_logical_end //transitions to wqm
p_end_wqm //transitions to exact

We rely on ssa elimination to clean most of this up.

fossil-db (navi21):
Totals from 1 (0.00% of 79330) affected shaders:
Instrs: 111 -> 110 (-0.90%)
CodeSize: 572 -> 568 (-0.70%)
Copies: 16 -> 15 (-6.25%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25440>

src/amd/compiler/aco_instruction_selection.cpp

@@ -11441,6 +11441,7 @@ finish_program(isel_context* ctx)
          /* End WQM before: */
          if (instr->isVMEM() || instr->isFlatLike() || instr->isDS() || instr->isEXP() ||
              instr->opcode == aco_opcode::p_dual_src_export_gfx11 ||
+             instr->opcode == aco_opcode::p_jump_to_epilog ||
              instr->opcode == aco_opcode::p_logical_start)
             break;