Changes

[mlir][python] Factor out standalone OpView._ods_build_default class method.

* This allows us to hoist trait level information for regions and sized-variadic to class level attributes (_ODS_REGIONS, _ODS_OPERAND_SEGMENTS, _ODS_RESULT_SEGMENTS).
* Eliminates some splicey python generated code in favor of a native helper for it.
* Makes it possible to implement custom, variadic and region based builders with one line of python, without needing to manually code access to the segment attributes.
* Needs follow-on work for region based callbacks and support for SingleBlockImplicitTerminator.
* A follow-up will actually add ODS support for generating custom Python builders that delegate to this new method.
* Also includes the start of an e2e sample for constructing linalg ops where this limitation was discovered (working progressively through this example and cleaning up as I go).

Differential Revision: https://reviews.llvm.org/D94738

[flang][driver] Move isFixedFormSuffix and isFreeFormSuffix to flangFrontend

isFixedFormSuffix and isFreeFormSuffix should be defined in
flangFrontend rather than flangFrontendTool library. That's for 2
reasons:
  * these methods are used in flangFrontend rather than flangFrontendTool
  * flangFrontendTool depends on flangFrontend

As mentioned in the post-commit review for D94228, without this change
shared library builds fail.

Differential Revision: https://reviews.llvm.org/D94968

[lldb][docs] Add a doc page for enums and constants

Enums and constants are currently missing in the new LLDB Python API docs.

In theory we could just let them be autogenerated like the SB API classes, but sadly the generated documentation
suffers from a bunch of problems. Most of these problems come from the way SWIG is representing enums, which is
done by translating every single enum case into its own constant. This has a bunch of nasty effects:

* Because SWIG throws away the enum types, we can't actually reference the enum type itself in the API. Also because automodapi is impossible to script, this can't be fixed in post (at least without running like sed over the output files).
* The lack of enum types also causes that every enum *case* has its own full doc page. Having a full doc page that just shows a single enum case is pointless and it really slows down sphinx.
* There is no SWIG code for the enums, so there is also no place to write documentation strings for them. Also there is no support for copying the doxygen strings (which would be in the wrong format, but better than nothing) for enums (let alone our defines), so we can't really document all this code.
* Because the enum cases are just forwards to the native lldb module (which we mock), automodapi actually takes the `Mock` docstrings and adds it to every single enum case.

I don't see any way to solve this via automodapi or SWIG. The most reasonable way to solve this is IMHO to write a simple Clang tool
that just parses our enum/constant headers and emits an *.rst file that we check in. This way we can do all the LLDB-specific enum case and constant
grouping that we need to make a readable documentation page.

As we're without any real documentation until I get around to write that tool, I wrote a doc page for the enums/constants as a stop gap measure.
Most of this is done by just grepping our enum header and then manually cleaning up all the artifacts and copying the few doc strings we have.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D94959

[ARM] Expand vXi1 VSELECT's

We have no lowering for VSELECT vXi1, vXi1, vXi1, so mark them as
expanded to turn them into a series of logical operations.

Differential Revision: https://reviews.llvm.org/D94946

[lldb][docs] Update .htaccess to redirect from old SB API documentation to new one

This is mostly SEO so that the new API can take over the old API when people
search for the different SB* classes. Sadly epydoc decided to throw in a -class
prefix behind all the class file names, so we can't just overwrite the old files
with the newly generated ones.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D94900

[Polly] Update isl to isl-0.23-61-g24e8cd12.

This fixes llvm.org/PR48554

Some test cases had to be updated because the hash function for
union_maps have been changed which affects the output order.

[SystemZ][z/OS] Fix Permission denied pattern matching

On z/OS, the error message "EDC5111I Permission denied." is not matched correctly in lit tests. This patch updates the check expression to match successfully.

Differential Revision: https://reviews.llvm.org/D94432