[clang] [clang][DebugInfo] Attach DW_AT_const_value to static data-member definitions if available (PR #72730)

[J. Ryan Stinnett via cfe-commits]

https://github.com/jryans commented:

Overall this looks good, thanks!

I think we may want to add a test to check that the output DWARF has a const value in the expected place, since consumers are relying on it.

https://github.com/llvm/llvm-project/pull/72730