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* Enable flush on Windows

- Implements perm 5 from https://github.com/openmm/openmm/issues/3937#issuecomment-1413872621

Co-Authored-By: Philip Turner <philipturner.AR@gmail.com>

* Add brackets for clarification
Co-authored-by: Philip Turner <philipturner.AR@gmail.com>

* Make this optimization only apply to AMD GPUs

* Switch to perm 1

- Flush before call to computeNonbonded since it works well on Windows and Linux

* Update OpenCLNonbondedUtilities.cpp

* Perm 4 is now significantly faster on Windows

* Use isAMD

* Fix indentation

* Fix missed variable

* Remove Mac check

* Remove isAMD out of Mac code

* Consistent (lack of) brackets style

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Co-authored-by: Philip Turner <philipturner.AR@gmail.com>