[clang] [Clang] Generate the GEP instead of adding AST nodes (PR #73730)

[Bill Wendling via cfe-commits]

bwendling wrote:

> Hey, that looks pretty good! I'm surprised it wasn't too much more work to convert to generating the GEP directly. Nice job!
> 
> Does this change result in codegen differences in IR? (was expecting test changes that used "fork" loads and "bork" GEPs)

Thanks. There will be. There's an issue I need to hammer out with the "union_of_fams". I wanted to get everyone's opinion on this method though before I invested a ton more time on it first. :-)

https://github.com/llvm/llvm-project/pull/73730