[llvm] [TargetRegistry] Remove deprecated createTargetMachine (PR #161053)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

Marking this as a draft for now. I want to land some PRs in downstreams that we import internally first:
1. https://github.com/tensorflow/tensorflow/pull/101237
2. https://github.com/google/gematria/pull/367
3. https://github.com/google/gematria/pull/368
4. https://github.com/google/llvm-propeller/pull/373
5. https://github.com/google/llvm-propeller/pull/374
6. https://github.com/jax-ml/jax/pull/32161

(A couple more to come)

https://github.com/llvm/llvm-project/pull/161053