[clang] [Clang] fix generic lambda inside requires-clause of friend function template (PR #99813)

[Younan Zhang via cfe-commits]

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@@ -1691,10 +1691,7 @@ class ConstraintRefersToContainingTemplateChecker
   using inherited::TransformTemplateTypeParmType;
   QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB,
                                          TemplateTypeParmTypeLoc TL, bool) {
-    assert(TL.getDecl()->getDepth() <= TemplateDepth &&
-           "Nothing should reference a value below the actual template depth, "
-           "depth is likely wrong");
-    if (TL.getDecl()->getDepth() != TemplateDepth)
+    if (TL.getDecl()->getDepth() < TemplateDepth)
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zyn0217 wrote:

I don't see the justification for removing the assert here. When would we otherwise hit it?

Besides, we have the same pattern in `TransformTemplateTypeParmType()` above. Does it also impact anything?

https://github.com/llvm/llvm-project/pull/99813