[clang] [Clang] Access tls_guard via llvm.threadlocal.address (PR #96633)

[John McCall via cfe-commits]

================
@@ -769,9 +777,10 @@ void CodeGenModule::EmitCXXModuleInitFunc(Module *Primary) 
{
       CharUnits GuardAlign = CharUnits::One();
       Guard->setAlignment(GuardAlign.getAsAlign());
       GuardAddr = ConstantAddress(Guard, Int8Ty, GuardAlign);
+      IsTLS = Guard->isThreadLocal();
     }
-    CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, ModuleInits,
-                                                     GuardAddr);
+    CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, ModuleInits, 
GuardAddr,
+                                                     IsTLS);
----------------
rjmccall wrote:

```suggestion
                                                     /*IsTLS*/ false);
```

https://github.com/llvm/llvm-project/pull/96633
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