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 <[email protected]>
Reviewed-by: Jamie Madill <[email protected]>
Commit-Queue: Jamie Madill <[email protected]>

Author: courtney-g

src/tests/gl_tests/GLSLTest.cpp

@@ -2605,6 +2605,9 @@ TEST_P(GLSLTest, RenderTrisWithPointCoord)
 // Convers a bug with the integer pow statement workaround.
 TEST_P(GLSLTest, NestedPowStatements)
 {
+    // https://crbug.com/1127866 - possible NVIDIA driver issue
+    ANGLE_SKIP_TEST_IF(IsNVIDIA() && IsVulkan() && IsWindows());
+
     constexpr char kFS[] =
         "precision mediump float;\n"
         "float func(float v)\n"