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

[Bill Wendling via cfe-commits]

bwendling wrote:

> I agree users probably shouldn't be doing that... but given it compiles your code should handle it gracefully. (It should just be a matter of making sure you don't recurse too deeply through the "base".)

*nods* However, the code it generates might not be what they want...but I'll try my best.

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