[clang] [CIR][docs] C++ cleanup and exception handling design for CIR (PR #177625)

[Andy Kaylor via cfe-commits]

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+=============================================
+ClangIR Cleanup and Exception Handling Design
+=============================================
+
+.. contents::
+   :local:
+
+Overview
+========
+
+This document describes the proposed new design for C++ cleanups and exception
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andykaylor wrote:

I definitely need to do that before this is committed. This reflects the way I was thinking about the design as I wrote it, but if it's accepted it will need to be updated as you suggest.

https://github.com/llvm/llvm-project/pull/177625