[clang] [Clang] Fix handling of reference types in tryEvaluateBuiltinObjectSize (PR #138247)

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zhscn wrote:

> > Could this PR be backported to the release/20.x branch which also has the same issue?
> 
> I don't believe so, typically we save backports for regressions since the previous version. Although, I tried messing with the example, and I don't see a difference in behavior between the 20.1 and the trunk branch?

Please check out https://godbolt.org/z/shTezPvx4

https://github.com/llvm/llvm-project/pull/138247