[llvm] [BOLT] Use symbol table info in registerFragment (PR #89648)

[Maksim Panchenko via llvm-commits]

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@@ -490,6 +490,9 @@ class RewriteInstance {
   /// Store all non-zero symbols in this map for a quick address lookup.
   std::map<uint64_t, llvm::object::SymbolRef> FileSymRefs;
 
+  /// FILE symbols used for disambiguating split function parents.
+  std::vector<object::DataRefImpl> FileSymbols;
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maksfb wrote:

Are you using `DataRefImpl` instead of `SymbolRef`/`ELFSymbolRef` to save space?

https://github.com/llvm/llvm-project/pull/89648