Vector API reproducibility bug (?)

[Quân Anh Mai]

Hi, the simple reason is that results produced by `java.lang.Math` are not
required to be reproducible. In particular, `java.lang.Math::acos` allows
1ulp of errors and only requires semi-monotonicity. As a result, different
implementations (vector vs scalar implementation) are allowed to produce
different results for the same input.

Regards
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