Added failing test cases for issue #1781: Internal assertion failures when compiling certain select expressions for OpenGL target.
Added failing test cases for issue #1781:
Internal assertion failures when compiling certain select expressions for OpenGL target.

kgnk/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide