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nir: reuse existing psiz-variable

Erik Faye-Lund requested to merge kusma/mesa:fixup-lower_point_size_mov-reviewed into master

For shaders where there's already a psiz-variable, we should rather reuse it than create a second one. This can happen if a shader writes gl_PointSize, but disables GL_PROGRAM_POINT_SIZE.

Fixes: 878c9428 ("nir: add lowering-pass for point-size mov") Reviewed-by: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com

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