[clang] [Clang] Initialize AtLeastAsSpecialized to prevent undefined behavior in Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs() (PR #95195)

[Matheus Izvekov via cfe-commits]

================
@@ -6447,7 +6447,7 @@ bool 
Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs(
   if (Inst.isInvalid())
     return false;
 
-  bool AtLeastAsSpecialized;
+  bool AtLeastAsSpecialized = false;
   runWithSufficientStackSpace(Info.getLocation(), [&] {
----------------
mizvekov wrote:

runWithSufficientStackSpace is a small helper used to prevent stack exhaustion.

https://github.com/llvm/llvm-project/pull/95195
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