i965/gen4: Fix message parameter loading for 1D TXD sampling.
We were neglecting to load dvdx and dvdy. v is not optional. Fixes glslparsertests tex-grad-0[12345].frag on Broadwater/Crestline. (We still need an execution test using sampler1D.) NOTE: This is a candidate for the 7.11 branch. Reviewed-by:Eric Anholt <eric@anholt.net> Reviewed-by:
Ian Romanick <ian.d.romanick@intel.com> Signed-off-by:
Kenneth Graunke <kenneth@whitecape.org> (cherry picked from commit 3e1fd13f)
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