[llvm] [DataLayout] Introduce DataLayout::getPointerAddressSize(AS) (PR #137412)

[Alexander Richardson via llvm-commits]

arichardson wrote:

Closing this PR that introduces a new component since the conclusion on https://discourse.llvm.org/t/clarifiying-the-semantics-of-ptrtoint/83987/49 was to define it to be the same as the index width. Uploaded https://github.com/llvm/llvm-project/pull/139347 instead for the new version.

https://github.com/llvm/llvm-project/pull/137412