[llvm] [libcxx] [clang-tools-extra] [clang] [libcxx] adds ranges::fold_left_with_iter and ranges::fold_left (PR #75259)

[Konstantin Varlamov via cfe-commits]

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@@ -0,0 +1,89 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TEST_SUPPORT_INVOCABLE_WITH_TELEMETRY_H
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var-const wrote:

No action required: we already have at least `TracedCopyMove` and `TracedAssignment` in `support/copy_move_types.h`, and I'm almost confident there are a few other similar types defined more locally in various tests. Is this class intended to supersede those? Or to provide C++20-only benefits?

https://github.com/llvm/llvm-project/pull/75259