[lldb] [llvm] [lldb][NFC][MachO] Clean up LC_THREAD reading code, remove i386 corefile (PR #146480)

[Jason Molenda via llvm-commits]

jasonmolenda wrote:

> Sorry for going off-topic, but what does this say about the support for `i386-apple-*` as a whole? I find the prospect of dropping that exciting, as I believe that is the only target where eh_ and debug_frame register numbers are different.

I think we can remove i386-macos support, short of booting a seven year old OS on a machine at least that old, and who knows if everything in C++17 we use is even supported by the compilers back then.  I know there are sometimes open source people trying to build & use a modern lldb on older configurations, but I think this would be a tough one to have working at this point.  I wouldn't feel bad about any patches removing this support.  I'll try to start removing these things as I have time/see an opportunity.

Apple announced that the macOS version being released in a few months (macOS 26) would be the final version that supports Intel machines at all.  We'll have a business requirement to keep the 64-bit Intel support for another release cycle or so after that.  What open source contributors might be using the llvm.org sources on is a different question, but the entire target support is going to go away before much longer I think.

https://github.com/llvm/llvm-project/pull/146480