Most of these are just places that want the first user and aren't
iterating over the whole list.

While there I changed some use_size() == 1 to hasOneUse() which
is more efficient.

This is part of an effort to rename use_iterator to user_iterator
and provide a use_iterator that dereferences to SDUse&. This patch
helps reduce the diff on later patches.

Re-landing #116970 after fixing miscompilation error.

The original change made it possible for CMPZ to have multiple uses;
`ARMDAGToDAGISel::SelectCMPZ` was not prepared for this.

Pull Request: https://github.com/llvm/llvm-project/pull/118887


Original commit message:

Following #116547 and #116676, this PR changes the type of results and
operands of some nodes to accept / return a normal type instead of Glue.

Unfortunately, changing the result type of one node requires changing
the operand types of all potential consumer nodes, which in turn
requires changing the result types of all other possible producer nodes.
So this is a bulk change.

There were two bugs in the implementation of the MVE vsbciq (subtract
with carry across vector, with initial carry value) intrinsics:
* The VSBCI instruction behaves as if the carry-in is always set, but we
were selecting it when the carry-in is clear.
* The vsbciq intrinsics should generate IR with the carry-in set, but
they were leaving it clear.

These two bugs almost cancelled each other out, but resulted in
incorrect code when the vsbcq intrinsics (with a carry-in) were used,
and the carry-in was a compile time constant.

Reverts llvm/llvm-project#116970.

This change broke Wine compiled for armv7, causing segfaults when
starting Wine. See llvm/llvm-project#116970 for more detailed discussion
about the issue.

Following #116547 and #116676, this PR changes the type of results and
operands of some nodes to accept / return a normal type instead of Glue.

Unfortunately, changing the result type of one node requires changing
the operand types of all potential consumer nodes, which in turn
requires changing the result types of all other possible producer nodes.
So this is a bulk change.

Pull Request: https://github.com/llvm/llvm-project/pull/116970

Identified with misc-include-cleaner.

- Fix build with `EXPENSIVE_CHECKS`
- Remove unused `PassName::ID` to resolve warning
- Mark `~SelectionDAGISel` virtual so AArch64 backend can work properly

This reverts commit de37c06f01772e02465ccc9f538894c76d89a7a1 to
de37c06f01772e02465ccc9f538894c76d89a7a1

It still breaks EXPENSIVE_CHECKS build. Sorry.