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

[David Blaikie via cfe-commits]

dwblaikie wrote:

https://github.com/llvm/llvm-project/blob/abd85cd473afedf112bf00630a22382fee4a7853/llvm/lib/CodeGen/GlobalMerge.cpp#L531 - this is around where I think we'd get a global with a location and a non-empty expression

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