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

[via cfe-commits]

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@@ -377,7 +377,7 @@ ExprDependence clang::computeDependence(PackExpansionExpr 
*E) {
 ExprDependence clang::computeDependence(PackIndexingExpr *E) {
   ExprDependence D = E->getIndexExpr()->getDependence();
   if (D & ExprDependence::Value)
-    D |= ExprDependence::TypeInstantiation;
+    D |= E->getPackIdExpression()->getDependence() & ExprDependence::Type;
----------------
RungeCC wrote:

Possibly `PackExpr->getExpressions().front()` for the type-independent 
`PackExpr` with its `IndexExpr` instantiation-dependent? I'm not sure whether 
we need an empty-check here.

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