[llvm] [DWARF] Speedup .gdb_index dumping (PR #151806)

[David Blaikie via llvm-commits]

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@@ -60,6 +61,24 @@ void DWARFGdbIndex::dumpSymbolTable(raw_ostream &OS) const {
                ", filled slots:",
                SymbolTableOffset, (uint64_t)SymbolTable.size())
      << '\n';
+
+  std::unordered_map<uint32_t, decltype(ConstantPoolVectors)::const_iterator>
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dwblaikie wrote:

Probably use a `DenseMap`? ( https://llvm.org/docs/ProgrammersManual.html#picking-the-right-data-structure-for-a-task )

https://github.com/llvm/llvm-project/pull/151806