[llvm] [KeyInstr] Add fields to DILocation behind compile time flag (PR #133477)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

> LGTM. Bitcode changes to come later or something?

Indeed - that's not in the stack yet though, as I need to sand off some rough edges around merging modules built with and without the feature.


https://github.com/llvm/llvm-project/pull/133477