RuntimeDyldELF: Clear GOTOffsetMap when resetting GOT section

[gmarkall]

Summary

When the GOT section ID is reset, the GOTOffsetMap must also be cleared,
otherwise spurious matches can be located when handling GOT relocations
in subsequently-linked objects.

Fixes Issue #61402 - see https://github.com/llvm/llvm-project/issues/61402.

[lhames]

Finally got a chance to test this out. LGTM.

@gmarkall Do you have commit access? If not I can commit on your behalf, just let me know what name and email address you'd like me to use for attribution.

[gmarkall]

@lhames Many thanks for the review! I don't have commit access - if you could use the email address "Graham Markall <[e-mail]>", that would be great - many thanks!

[lhames]

Done. Thanks again @gmarkall!

llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp

else
       consumeError(NameOrErr.takeError());
 
     if (Name == ".eh_frame") {
       UnregisteredEHFrameSections.push_back(i->second);
       break;
     }
   }
 
+  GOTOffsetMap.clear();
   GOTSectionID = 0;
   CurrentGOTIndex = 0;
 
   return Error::success();
 }
 
 bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const {
   return Obj.isELF();