[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?
> 
> Please check out https://godbolt.org/z/shTezPvx4

Ah, huh... it DOES look like this i doesn't fail in 19, right?  @cor3ntin : WDYT?

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