[clang] [Clang][counted-by] Bail out of visitor for LValueToRValue cast (PR #125571)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

My expectation was that this would affect the tests from #125298, because the MemberExpr there is a child of an LValueToRValue conversion.  I could be missing something, though?

https://github.com/llvm/llvm-project/pull/125571