linker: Calculate used samplers and shadow samplers in the linker

It used to be done in ir_to_mesa, and that was kind of a bad place.

I didn't change st_glsl_to_tgsi because there is some strange stuff
happening in the code that generates glDrawPixels shaders.  It looked
like this would break horribly if I touched anything.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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