[llvm] [DAG] Add freeze(assertext(x)) -> assertext(x) folds (PR #94491)

[Matt Arsenault via llvm-commits]

================
@@ -57,7 +57,10 @@ enum NodeType {
   /// been extended, and the second is a value type node indicating the width
   /// of the extension.
   /// NOTE: In case of the source value (or any vector element value) is
-  /// poisoned the assertion will not be true for that value.
+  /// poisoned the assertion will not be true for that value and the
----------------
arsenm wrote:

Can you update the globalisel equivalent documentation to match whatever ends up here for G_ASSERT_SEXT/G_ASSERT_ZEXT?

https://github.com/llvm/llvm-project/pull/94491