[clang] [llvm] [ConstantFold] Drop gep of gep fold entirely (PR #95126)

[Nikita Popov via cfe-commits]

nikic wrote:

> See [51e459a](https://github.com/llvm/llvm-project/commit/51e459a561519c8d51e2b4cadddc0d1f99c8b7ef):
> 
> > This causes some non-trivial text size increases in unoptimized builds for Bullet. Revert while I investigate.
> 
> Can you double check this?

This was mitigated by https://github.com/llvm/llvm-project/pull/93956. I did check that this patch does not cause code size regression for O0.

https://github.com/llvm/llvm-project/pull/95126