[clang] [clang-repl] Fix crashing on unusable top-level declarations (PR #230054)

[Douglas Yung via cfe-commits]

dyung wrote:

@IvyXu420 aand @vgvassilev the test modified in this change seems to be failing on a Windows bot, can you take a look?

https://lab.llvm.org/buildbot/#/builders/46/builds/42541

https://github.com/llvm/llvm-project/pull/230054