test_shaders: Add the option to generate diff instead.
test_shaders: Add the option to generate diff instead.

Signed-off-by: Sebastián Aedo <c7b9a56f5165ab2bd774f91917113b46805c5aa8@codeweavers.com>

KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross