Revert "Fixing execution region result placement. (#19872)"

[stbaione]

This reverts the changes to SchedulingExecution.cpp from commit 4fffb0e.

This change caused corrupt tokens to be outputted from sharded llama models (#19948).

After bisecting, I was able to get good outputs again after reverting the specific changes to ScheduleExecution.cpp.

[ScottTodd]

If we want to publish a 3.2.1 patch release with this change, we would backport onto https://github.com/iree-org/iree/tree/v3.2.0 and follow the instructions at https://iree.dev/developers/general/release-management/#creating-a-patch-release

It would be our first time following those instructions, so I'm not sure if the commands are what we want... may want to stick to git tags and not create a branch...?

[stbaione]

If we want to publish a 3.2.1 patch release with this change, we would backport onto https://github.com/iree-org/iree/tree/v3.2.0 and follow the instructions at https://iree.dev/developers/general/release-management/#creating-a-patch-release

It would be our first time following those instructions, so I'm not sure if the commands are what we want... may want to stick to git tags and not create a branch...?

Gotcha, I can try that. I was originally going to push to iree-org directly (hence branch name), but created this fork, since I didn't have proper permissions. I assume I'll need them to be enabled to create the patch-release branch

[ScottTodd]

I'd prefer for @marbre or myself to do the release branching. That type of work typically needs elevated permissions and has sharp edges to watch for. Let's work the problem on this PR and then decide if we want to go through the effort of publishing a patch release.