message: Do not gather_methods on DexDebugInstructions
  Summary: It simplifies the `gather_methods()` logic for `IRList` in preparation for the type analysis powered RemoveUnreachable work.
diff: @@ -130,6 +130,8 @@ void MethodItemEntry::gather_methods(
  case MFLOW_POSITION:
  case MFLOW_FALLTHROUGH:
  case MFLOW_TARGET:
  + // DexDebugInstruction does not have method reference.
  + case MFLOW_DEBUG:
  break;
  case MFLOW_OPCODE:
  insn->gather_methods(lmethod);
  @@ -137,9 +139,7 @@ void MethodItemEntry::gather_methods(
  case MFLOW_DEX_OPCODE:
  dex_insn->gather_methods(lmethod);
  break;
  - case MFLOW_DEBUG:
  - dbgop->gather_methods(lmethod);
  - break;
  +
  }
  }
  