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

[Erich Keane via cfe-commits]

erichkeane 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?

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