See https://github.com/llvm/llvm-project/pull/147168 for more info.

These are identified by misc-include-cleaner.  I've filtered out those
that break builds.  Also, I'm staying away from llvm-config.h,
config.h, and Compiler.h, which likely cause platform- or
compiler-specific build failures.

LLVM already supports overflow flags on `llvm.trunc` for a while. This
commit adds support for these flags to `arith.trunci`.

Reland https://github.com/llvm/llvm-project/pull/125148

Limiting vector pattern caused issues with `select` of complex lowering,
which wasn't caught as it was missing lit tests. Keep the pattern as is
for now and instead set a higher benefit to `IdentityBitcastLowering` so
it will always run before the vector pattern.

Reverts llvm/llvm-project#125148

bot failures

`arith.bitcast` is allowed on memrefs and such code can actually be
generated by IREE `ConvertBf16ArithToF32Pass`.
`LLVM::detail::vectorOneToOneRewrite` doesn't properly check its types
and will generate bitcast between structs which is illegal.

With the opaque pointers this is a no-op operation for memref so we can
just add type check in `LLVM::detail::vectorOneToOneRewrite` and add a
separate pattern which removes op if converted types are the same.

When running `convert-to-llvm`, `ceildiv` and `floordiv` ops, which do not
have direct llvm conversion pattern, would not get lowered to llvm
dialect. This patch adds CeilFloorDivExpandOpsPatterns to both
`convert-to-llvm` and `arith-to-llvm` (deprecated) lowering those ops to
lower level arith ops which can be lowered to llvm using LLVM
conversion.

Reland of https://github.com/llvm/llvm-project/pull/117305 after
buildbot failures.
See:
https://lab.llvm.org/buildbot/#/builders/80/builds/7168
https://lab.llvm.org/buildbot/#/builders/130/builds/7036
https://lab.llvm.org/buildbot/#/builders/138/builds/7290

Added dependence to ArithTransforms in ArithToLLVM. In previous
discussion, it has been suggested to move the
CeilFloorDivExpandOpsPatterns to ArithUtils but I think linking
ArithTransforms makes more sense as otherwise :
* ArithToLLVM needs a new dependency to ArithUtils
* ArithUtils needs new dependency to ArithTransforms or move the
patterns as well which will create more dependencies
* It creates lots of code motion which makes it hard to review.

This reverts commit 4a7b56e6e7dd0f83c379ad06b6e81450bc691ba6.

There is no agreement.

Failing bot:
  * https://lab.llvm.org/buildbot/#/builders/138/builds/729

Also, not all discussions have been resolved:
  * https://github.com/llvm/llvm-project/pull/117305#discussion_r1861194201

This reverts commit 2c739dfd53fde0995f91c8a2c11ec803041bac86.

Arith Floor and Ceil ops would not get lowered when running
--convert-arith-to-llvm.