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

[Erich Keane via cfe-commits]

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@@ -0,0 +1,1258 @@
+=============================================
+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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erichkeane wrote:

Since we intend this to be long-living, I wonder if we should remove the 'proposed' bit here and just make it 'the design for C++ cleanups...'

Rest of this section might want its tense changed the same way?  

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