[llvm] [llvm-strip] Remove empty SHT_GROUP sections. (PR #97204)

[Thorsten Schütt via llvm-commits]

================
@@ -2206,8 +2206,16 @@ Error Object::removeSections(
   // Transfer removed sections into the Object RemovedSections container for use
   // later.
   std::move(Iter, Sections.end(), std::back_inserter(RemovedSections));
-  // Now finally get rid of them all together.
+  // Now get rid of them all together.
   Sections.erase(Iter, std::end(Sections));
+
+  // Finally iterate over all sections and erase empty SHT_GROUP sections.
+  for (auto Iter = Sections.begin(); Iter != Sections.end(); ++Iter) {
----------------
tschuett wrote:

Or:
```
llvm::remove_if(Sections, Lambda_Predicate);
```

https://github.com/llvm/llvm-project/pull/97204