i965: Don't try to apply the opt_sampler_eot extension for vs

The opt_sampler_eot optimisation of fs_visitor effectively assumes
that it is running on a fragment shader because it casts the program
key to a brw_wm_prog_key. However on Skylake fs_visitor can also be
used for vertex shaders. It looks like this usually works anyway
because the optimisation is skipped if key->nr_color_regions != 1.
However for a vertex shader the key is actually a brw_vs_prog_key so
the space for nr_color_regions is probably taken up by
key->base.program_string_id. This can end up making nr_color_regions
be 1 in which case the function will later assert when the last
instruction is not FS_OPCODE_FB_WRITE. This was making the DEQP test
suite assert. Presumably this only happens there because that compiles
a lot of shaders so it would end up with a high value for
program_string_id.

Reviewed-by: Kristian Høgsberg <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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