[clang] [Clang][Sema] Avoid pack expansion for expanded empty PackIndexingExprs (PR #92385)

[via cfe-commits]

================
@@ -4377,15 +4377,20 @@ class PackIndexingExpr final
   // The pack being indexed, followed by the index
   Stmt *SubExprs[2];
 
-  size_t TransformedExpressions;
+  // The size of the trailing expressions.
+  unsigned TransformedExpressions : 31;
+
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned EmptyPack : 1;
----------------
cor3ntin wrote:

I think i previously suggested a better name for that

https://github.com/llvm/llvm-project/pull/92385