aco: Fix uniform i2i64.

Timur Kristóf requested to merge Venemo/mesa:aco-i2i64-fix into master

Fixes 240 failing test cases in dEQP-VK.spirv_assembly which were failing due to a bad s_ashr_i32 instruction. This commit fixes the instruction format along with the definitions of the instruction.

Fixes: 11f43caa Cc: 19.3 Signed-off-by: Timur Kristóf

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