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

[Lang Hames via llvm-commits]

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@@ -493,7 +494,7 @@ createLinkGraphFromMachOObject_x86_64(MemoryBufferRef ObjectBuffer) {
   if (!Features)
     return Features.takeError();
 
-  return MachOLinkGraphBuilder_x86_64(**MachOObj, std::move(*Features))
+  return MachOLinkGraphBuilder_x86_64(**MachOObj, SSP, std::move(*Features))
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lhames wrote:

```c++
std::move(SSP)
```

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