message: Make loop counter unsigned in SymbolFilePDB::GetCompileUnitIndex
  Summary: This fixes a clang warning.
  Reviewers: zturner
  Subscribers: zturner, lldb-commits
diff: @@ -211,7 +211,7 @@ void SymbolFilePDB::GetCompileUnitIndex(
  if (!results_up)
  return;
  auto uid = pdb_compiland->getSymIndexId();
  - for (int cu_idx = 0; cu_idx < GetNumCompileUnits(); ++cu_idx) {
  + for (uint32_t cu_idx = 0; cu_idx < GetNumCompileUnits(); ++cu_idx) {
  auto compiland_up = results_up->getChildAtIndex(cu_idx);
  if (!compiland_up)
  continue;
  