These are module level concepts, and attaching them to the
function level subtarget is confusing. Similarly these other
helpers that only operate on the triple should also be removed
from the subtarget.

With clang-format this time.

Original message:
This allows us to use Register in the interface, but store an
unsigned internally in a union.

This reverts commit d47bc6fd93f9f439a54fd7cf55cdcb2e2ca0cfcb.

I forgot to commit clang-format cleanup before I pushed this.

This allows us to use Register in the interface, but store an
unsigned internally in a union.

This focuses on the common interfaces and tablegen. More changes
are needed to individual targets.

Identified with misc-include-cleaner.

This is a preparation for changing the data structure of MBBMap.

This reverts commit 740161a9b98c9920dedf1852b5f1c94d0a683af5.

I moved the `ISD` dependencies into the CodeGen portion of the handling,
it's a little awkward but it's the easiest solution I can think of for
now.

This reverts commit c05126bdfc3b02daa37d11056fa43db1a6cdef69.
(llvmorg-19-init-17714-gc05126bdfc3b)
See #99610