[llvm] [llvm] Replace unordered_{map,set} with Dense{Map,Set}/SmallPtrSet (PR #202222)

[Alexis Engelke via llvm-commits]

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@@ -2235,7 +2235,7 @@ Error Object::removeSections(
   // Now make sure there are no remaining references to the sections that will
   // be removed. Sometimes it is impossible to remove a reference so we emit
   // an error here instead.
-  std::unordered_set<const SectionBase *> RemoveSections;
+  SmallPtrSet<const SectionBase *, 0> RemoveSections;
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aengelke wrote:

use some relaistic value like 4 or 8 here?

https://github.com/llvm/llvm-project/pull/202222