[Driver] Avoid repeated hash lookups (NFC) (#108676)

Author: kazutakahirata

clang/lib/Driver/OffloadBundler.cpp

@@ -1760,16 +1760,8 @@ Error OffloadBundler::UnbundleArchive() {
 
           // For inserting <CompatibleTarget, list<CodeObject>> entry in
           // OutputArchivesMap.
-          if (!OutputArchivesMap.contains(CompatibleTarget)) {
-
-            std::vector<NewArchiveMember> ArchiveMembers;
-            ArchiveMembers.push_back(NewArchiveMember(MemBufRef));
-            OutputArchivesMap.insert_or_assign(CompatibleTarget,
-                                               std::move(ArchiveMembers));
-          } else {
-            OutputArchivesMap[CompatibleTarget].push_back(
-                NewArchiveMember(MemBufRef));
-          }
+          OutputArchivesMap[CompatibleTarget].push_back(
+              NewArchiveMember(MemBufRef));
         }
       }