Bug ID: 44912
           Summary: [AMDGPU][MC][GFX908] dot opcodes operating 4-bit and
                    8-bit packed data should not support op_sel
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU

dot opcodes that have packed data smaller than 16 bits should not allow
op_sel/op_sel_hi modifiers. This is confirmed by Justin Smith.

Examples of failed tests:

    v_dot4_u32_u8 v0, v1, v2, v3 op_sel:[1,1]
    v_dot8_i32_i4 v0, v1, v2, v3 op_sel_hi:[1,1]

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