InterpToArray test failing after CarpetInterp2 vectorisation optimisation

With the merging of carpetinterp2-vectorize-interpolation, the test InterpToArray.wavetoy2/2procs is now failing with, for example,

   arrays2d[0].x.asc: substantial differences
      significant differences on 3 (out of 3) lines
      maximum absolute difference in column 5 is 0.255929043803272
      maximum relative difference in column 5 is 0.659886735180889

This is on the build machine, which uses GCC. I only tested the change on Intel.

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