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Remove early returns in vtkDualDepthPeelingPass for osx.

Allison Vacanti requested to merge allisonvacanti/vtk:apple_depth_peel_fix into master

Restructured the fragment shader for the peeling pass to avoid early returns. Apparently the new OSX driver rearranges instructions such that the early returns occurred before dFdx and dFdy in the normal computation. This lead to garbage normals and incorrect shading.

Fixes #16824 (closed) .

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