[llvm] [PowerPC][GlobalMerge] Reduce TOC usage by merging internal and private global data (PR #95438)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

I don't think there's any reason anyone would want to allow merging internal globals, but not private globals; I think it's just an oversight.  Adding a flag to make it configurable doesn't really seem useful.

https://github.com/llvm/llvm-project/pull/95438