[llvm] TargetMachine: Remove pointer-size query methods (PR #226404)

[Alex Rønne Petersen via llvm-commits]

alexrp wrote:

> Really the ABI should be fully computable from the triple alone. The ABI name is a really pervasive hack that really should have been encoded or implied directly in the triple

Somewhat related, this is one of several reasons why I want libc-less environment names in the triple:

* https://github.com/llvm/llvm-project/pull/168042
* https://github.com/llvm/llvm-project/pull/202795

It would be nice if we could build some consensus on moving in the direction that the triple encodes all the necessary (and accurate) ABI information.

https://github.com/llvm/llvm-project/pull/226404