[llvm] ARM: Start moving runtime libcall configuration out of TargetLowering (PR #142617)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

I'm thinking that the test might be invalid given the new behavior. It relies on `lld-link` lazily loading the definition for `__rt_sdiv`. Now that everything is set up in RuntimeLibCalls, we end up with `__rt_sdiv` in the preopt IR so it lowers just fine since everything is together. I think that actually prevents the issue that 7f9a0048fa3fb5513c09731a7f82a851b0bcd609 was originally intending to catch/diagnose in the first place. I'm going to push a patch to delete the test to get buildbots unblocked.

@mstorsjo @arsenm Please let me know if I'm mistaken here/need to adjust something.

https://github.com/llvm/llvm-project/pull/142617