[llvm] [CGData] Outlined Hash Tree (PR #89792)

[Ellis Hoag via llvm-commits]

================
@@ -0,0 +1,131 @@
+//===-- OutlinedHashTree.cpp ----------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// An OutlinedHashTree is a Trie that contains sequences of stable hash values
+// of instructions that have been outlined. This OutlinedHashTree can be used
+// to understand the outlined instruction sequences collected across modules.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGenData/OutlinedHashTree.h"
+
+#include <stack>
+#include <tuple>
----------------
ellishg wrote:

```suggestion
```
I think these aren't needed anymore

https://github.com/llvm/llvm-project/pull/89792