[clang] Warn when unique objects might be duplicated in shared libraries (PR #117622)

[Hans Wennborg via cfe-commits]

================
@@ -508,6 +508,10 @@ New Compiler Flags
 - clang-cl and clang-dxc now support ``-fdiagnostics-color=[auto|never|always]``
   in addition to ``-f[no-]color-diagnostics``.
 
+- The ``-Wunique-object-duplication`` warning has been added to warn about objects
----------------
zmodem wrote:

I think this would fit better in the "Improvements to Clang's diagnostics" section below.

(That applies for the `-Warray-compare` notes above too..)

https://github.com/llvm/llvm-project/pull/117622