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ac/llvm: load 1 byte at a time if unaligned on gfx10

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:radeonsi_gfx10_unaligned into master

If buffer or stride is unaligned we use the same trick as on gfx6: load 1 byte at a time and recompose the output if needed. This change fixes lots of deqp/glcts tests:

  • dEQP-GLES2.functional.draw.random.1, 10, ...
  • dEQP-GLES2.functional.vertex_arrays.multiple_attributes.stride.3_float2_0_float2_0_float2_17, ...
  • dEQP-GLES2.functional.vertex_arrays.single_attribute.first.byte_first24_offset1_stride2_quads256, ...
  • dEQP-GLES2.functional.vertex_arrays.single_attribute.strides.buffer_0_17_byte2_vec4_dynamic_draw_quads_1, ...
  • dEQP-GLES31.functional.draw_indirect.random.14, ...

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