[llvm] [CAS] Add MappedFileRegionBumpPtr (PR #114099)

[Adrian Prantl via llvm-commits]

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@@ -0,0 +1,340 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+/// \file Implements MappedFileRegionBumpPtr.
+///
+/// A bump pointer allocator, backed by a memory-mapped file.
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adrian-prantl wrote:

Shouldn't this be the Doxygen comment of `MappedFileRegionBumpPtr`?

https://github.com/llvm/llvm-project/pull/114099