message: Remove hashing of old GCL environment variables
  Summary: Ref. T20018.
  Reviewers: #tensorflow, simonl, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, georgep, jakeh
  Subscribers: jakeh, bartoszb
  Maniphest Tasks: T20018
diff: @@ -213,9 +213,7 @@ std::vector<int64> GetGclHashes() {
  // Add a hash for each environment variable known to impact the GCL
  // compilation result.
  // TODO(T20018) - get this from GCL.
  - for (const char* name :
  - {"GCL_NUM_IO_TILES", "GCL_REAL_COLLECTIVES", "GCL_LIBRARY_PATH",
  - "GCL_MAX_BYTES_PER_TILE", "GCL_GP_PATH"}) {
  + for (const char* name : {"GCL_LIBRARY_PATH", "GCL_GP_PATH"}) {
  const char* value = std::getenv(name);
  if (value != nullptr) {
  hashes.push_back(std::hash<string>()(value));
  