[llvm] Move a lot of symbol code to use the symbol string pool (PR #115796)

[Lang Hames via llvm-commits]

================
@@ -136,7 +137,7 @@ BinaryContext::BinaryContext(std::unique_ptr<MCContext> Ctx,
                              std::unique_ptr<MCDisassembler> DisAsm,
                              JournalingStreams Logger)
     : Ctx(std::move(Ctx)), DwCtx(std::move(DwCtx)),
-      TheTriple(std::move(TheTriple)), TheTarget(TheTarget),
+      TheTriple(std::move(TheTriple)), SSP(SSP), TheTarget(TheTarget),
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lhames wrote:

```c++
SSP(std::move(SSP))
```
would eliminate a copy.

https://github.com/llvm/llvm-project/pull/115796