[clang] [llvm] [DropUnnecessaryAssumes] Add pass for dropping assumes (PR #159403)

[Florian Hahn via llvm-commits]

================
@@ -0,0 +1,28 @@
+//===------------------------------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Pass that drops assumes that are unlikely to be useful.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_DROPUNNECESSARYASSUMES_H
+#define LLVM_TRANSFORMS_SCALAR_DROPUNNECESSARYASSUMES_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class DropUnnecessaryAssumesPass
+    : public PassInfoMixin<DropUnnecessaryAssumesPass> {
+public:
----------------
fhahn wrote:

```suggestion
struct DropUnnecessaryAssumesPass
    : public PassInfoMixin<DropUnnecessaryAssumesPass> {
```

Having passes as classes with all public members is somewhat common, but I suppose this could just be a struct? Doesn't matter either way though

https://github.com/llvm/llvm-project/pull/159403