[llvm] [lld] [clang] Embed the command line arguments during LTO (PR #79390)

[Sam Clegg via cfe-commits]

================
@@ -40,6 +41,7 @@ using namespace llvm;
 namespace lld::wasm {
 static std::unique_ptr<lto::LTO> createLTO() {
   lto::Config c;
+  c.EmbedCmdArgs = commonContext().cmdArgs;
----------------
sbc100 wrote:

How about adding a helper like the existing ones `CommonLinkerContext.h`:

```
inline llvm::StringSaver &saver() { return context().saver; }
```

This means that the current linker code just calls `saver()` whenever it needs it.


https://github.com/llvm/llvm-project/pull/79390