[clang] [Sema] Compare canonical conversion function (PR #154158)

[Jonas Hahnfeld via cfe-commits]

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+// RUN: rm -rf %t
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hahnjo wrote:

It is the smallest reproducer we have for the moment. It cannot be integrated into `overload-decl.cpp` because we need modules to trigger deserialization and have overload resolution find different `FunctionDecl`s between constructing the conversion sequence for the copy and the move assignment.

https://github.com/llvm/llvm-project/pull/154158