message: fix circle ci: supply hash function class to unordered_set of enums
  Summary: Pull Request resolved:
diff: #include "PassManager.h"
  #include "Show.h"
  #include "Trace.h"
  +#include "Util.h"
  #include "Walkers.h"
  /**
  @@ -101,7 +102,9 @@ boost::optional<IRInstruction> BranchPrefixHoistingPass::get_next_common_insn(
  std::unordered_set<IRInstruction, decltype(irinsn_hash)> insns_at_iters(
  3, irinsn_hash);
  // record the (const val) uses and make sure theey are the same
  - std::unordered_set<constant_uses::TypeDemand> const_zero_use_types;
  + std::unordered_set<constant_uses::TypeDemand, EnumClassHash>
  + const_zero_use_types;
  +
  bool type_analysis_failed = false;
  for (unsigned i = 0; i < block_iters.size(); i++) {
  