i965/skl: Add a message header for the TXF_MCS instruction in vec4vs
When using SIMD4x2 on Skylake, the sampler instructions need a message header to select the correct mode. This was added for most sample instructions in 0ac4c272 but the TXF_MCS instruction is emitted separately and it was missed. This fixes a bunch of Piglit tests which test texelFetch in a geometry shader, for example: spec/arb_texture_multisample/texelfetch/2-gs-sampler2dms Cc: mesa-stable@lists.freedesktop.org Reviewed-by:Kenneth Graunke <kenneth@whitecape.org> (cherry picked from commit 5ae6c7bf)
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