Add a pass option to `convert-scf-to-cf` to deactivate pattern rollback
for better performance. The lowering patterns from SCF->CF to benefit a
lot from this feature because `splitBlock` is expensive in the rollback
driver.

Add a new unit attribute to allow for unsigned integer comparison.

Example:
```mlir
scf.for unsigned %iv_32 = %lb_32 to %ub_32 step %step_32 : i32 {
  // body
}
```

Discussion:
https://discourse.llvm.org/t/scf-should-scf-for-support-unsigned-comparison/84655

This is expanding on https://github.com/llvm/llvm-project/pull/102562 

This allows also propagating attributes for scf.while lowering

Do not access the erased `scf.while` operation in the lowering pattern.
That won't work anymore in a One-Shot Dialect Conversion and triggers a
use-after-free sanitizer error.

After the One-Shot Dialect Conversion refactoring, a
`ConversionPatternRewriter` will behave more like a normal
`PatternRewriter`.

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

Do not access the erased `scf.condition` operation in the lowering
pattern. That won't work anymore in a One-Shot Dialect Conversion and
triggers a use-after-free sanitizer error.

After the One-Shot Dialect Conversion refactoring, a
`ConversionPatternRewriter` will behave more like a normal
`PatternRewriter`.

As [required by LLVM](https://llvm.org/docs/LangRef.html#llvm-loop), the
loop annotation (loop metadata) should be attached on the ["latch"
block](https://llvm.org/docs/LoopTerminology.html). Otherwise, the
annotation might be ignored by LLVM. This PR fixes this issue.

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.

`let constructor` is deprecated since the table gen backend emits most
of the glue logic to build a pass. This PR retires the td method for
most (I need another pass) passes in the Conversion directory.

This patch fixed a crash when scf.parallel's region donesn't terminate
with reduce op. This can happend in dialect conversion.