Vulkan: Skip nested pow test on NVIDIA, Windows Suspect possible NVIDIA driver issue as unable to repro on some NVIDIA, Windows, NVIDIA configurations. Test: angle_end2end_tests --gtest_filter=GLSLTest.NestedPowStatements/ES3_Vulkan Bug: chromium:1127866 Change-Id: Ic6a95915af72aab086753a0e0199ac1dee8bfb62 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2410560 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>