freedreno/ir3: array offset can be negative

It at least happens with some piglit tests, like
$piglit/bin/vp-address-01

  VERT
  DCL IN[0]
  DCL IN[1]
  DCL OUT[0], POSITION
  DCL OUT[1], COLOR
  DCL CONST[0..7]
  DCL ADDR[0]
    0: ARL ADDR[0].x, IN[1].xxxx
    1: MOV_SAT OUT[1], CONST[ADDR[0].x-1]
    2: DP4 OUT[0].x, CONST[4], IN[0]
    3: DP4 OUT[0].y, CONST[5], IN[0]
    4: DP4 OUT[0].z, CONST[6], IN[0]
    5: DP4 OUT[0].w, CONST[7], IN[0]
    6: END

Signed-off-by: Rob Clark <[email protected]>

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