[clang] [C++] Fix a crash with __thread and dependent types (PR #140542)

[Aaron Ballman via cfe-commits]

================
@@ -14622,7 +14622,8 @@ void Sema::CheckCompleteVariableDeclaration(VarDecl 
*var) {
       Diag(var->getLocation(), diag::err_thread_nontrivial_dtor);
       if (getLangOpts().CPlusPlus11)
         Diag(var->getLocation(), diag::note_use_thread_local);
-    } else if (getLangOpts().CPlusPlus && var->hasInit()) {
+    } else if (getLangOpts().CPlusPlus && var->hasInit() &&
+               !var->getType()->isDependentType()) {
----------------
AaronBallman wrote:

Existing uses are fine The one case which could have been problematic is 
already checking that the initializer is not dependent.

https://github.com/llvm/llvm-project/pull/140542
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