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/+/2410560Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>