vc4: Avoid VS shader recompiles by keeping a set of FS inputs seen so far.

vc4: Avoid VS shader recompiles by keeping a set of FS inputs seen so far.

We don't want to bake the whole array into the FS key, because of the
hashing overhead.  But we can keep a set of the arrays seen, and use a
pointer to the copy in as the array's proxy.

Between this and the previous patch, gl-1.0-blend-func now passes on
hardware, where previously it was filling the 256MB CMA area with shaders
and OOMing.

Drops 712 shaders from shader-db.