Fix TextureUpgradeAndSamplerRemovalTransform when used with qualifiers

The transform removes sampler arguments from functions and function
calls; this causes function arguments to change their indices. When some
function arguments have an output qualifier, this qualifier can get lost
because of the removal which can lead to incorrect results (e.g. out
qualifier not having effect).

To fix this we iterate through both seq & qual arrays in lock-step and
manually remove/replace entries as appropriate.