[clang] [clang][CodeGen] Shift relink option implementation away from module cloning (PR #81693)

[Aaron Liu via cfe-commits]

================
@@ -257,37 +281,19 @@ bool BackendConsumer::LinkInModules(llvm::Module *M, bool 
ShouldLinkFiles) {
     CurLinkModule = LM.Module.get();
     bool Err;
----------------
AaronHLiu wrote:

Got error:
```
clang/lib/CodeGen/CodeGenAction.cpp:282:10: error: variable 'Err' set but not 
used [-Werror,-Wunused-but-set-variable]
    bool Err;
         ^
1 error generated.
```

https://github.com/llvm/llvm-project/pull/81693
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