[llvm] [GlobalMerge] Aggressively merge constants to reduce TOC entries (PR #111756)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

If you've done the analysis, and determined this is good enough for now, then that's fine.

LGTM

https://github.com/llvm/llvm-project/pull/111756