[llvm] [BOLT] Exit with error code on missing DWO CU (PR #125976)

[Maksim Panchenko via llvm-commits]

================
@@ -1759,7 +1759,10 @@ void BinaryContext::preprocessDebugInfo() {
           dwarf::toString(CU->getUnitDIE().find(dwarf::DW_AT_name), nullptr);
       if (std::optional<uint64_t> DWOID = CU->getDWOId()) {
         auto Iter = DWOCUs.find(*DWOID);
-        assert(Iter != DWOCUs.end() && "DWO CU was not found.");
+        if (Iter == DWOCUs.end()) {
+          this->errs() << "DWO CU was not found for " << Name << '\n';
----------------
maksfb wrote:

Include "BOLT-ERROR:".

https://github.com/llvm/llvm-project/pull/125976