[llvm] [Hexagon] Add Hexagon Copy Hoisting pass (PR #89313)

[Krzysztof Parzyszek via llvm-commits]

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@@ -0,0 +1,280 @@
+//===--------- HexagonCopyHoisting.cpp - Hexagon Copy Hoisting  ----------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+// The purpose of this pass is to move the copy instructions that are
+// present in all the successor of a basic block (BB) to the end of BB.
+//===----------------------------------------------------------------------===//
+
+#include "HexagonTargetMachine.h"
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringMap.h"
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kparzysz wrote:

I think this include can be removed (replaced with include of DenseMap.h).  DenseMap.h seems to be included indirectly by some other header file, but it's a good idea to include it directly (in case something changes in that other header file).

https://github.com/llvm/llvm-project/pull/89313