[clang] [Clang] Fix dependency computation for pack indexing expression (PR #91933)

[via cfe-commits]

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@@ -376,6 +376,9 @@ ExprDependence clang::computeDependence(PackExpansionExpr *E) {
 
 ExprDependence clang::computeDependence(PackIndexingExpr *E) {
   ExprDependence D = E->getIndexExpr()->getDependence();
+  if (D & ExprDependence::Value)
+    D |= ExprDependence::TypeInstantiation;
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cor3ntin wrote:

> Should E...[N] be treated as type-dependent regardless of the result being always an int?

Yes. (We don't do anything to look at whether all the expressions would have the same type)

https://github.com/llvm/llvm-project/pull/91933