[clang] Delete dead value dependence check. (PR #211706)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Updated with a version that resolves the issue with using a pointer as a template argument.  It's actually an existing bug: if you rewrite the example to use a reference instead of a pointer, it triggers without the patch.

Still trying to figure out a few more edge cases.

https://github.com/llvm/llvm-project/pull/211706