i965: Allocate URB space for HS and DS stages when required.

v2: (by Ken, incorporating feedback from Matt Turner):
- Rewrite the push constant allocation code to be clearer.
- Only apply the minimum VS entries workaround on Gen 8.

v3: (by Ken)
- Fix a bug in v2 where we failed to allocate the full push constant
  space when the number of enabled stages didn't divide the available
  push constant space evenly.  (Any left over space is now allocated
  to the PS, as it was in v1.)
- Fix an off-by-one error in v2's number of enabled stages calculation.
- Use DIV_ROUND_UP for nicer formatting.
- Line wrapping fixes.

Signed-off-by: Chris Forbes <[email protected]>
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>

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