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

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

Fixed the compile-time issue:
https://llvm-compile-time-tracker.com/compare.php?from=562a4559ee9b637714485169102f7a2600aab008&to=6d85de88c426a40b8e5d3cfcb0ed6564c7df12be&stat=instructions%3Au (though for transparency it looks like there's +0.08 to stage2-O0-g that's unaccounted for between the commits)

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