[Beignet] [BUG] built-in function acos/asin conformance test fail

[Sun, Yi]

AT least acos and asin can fail with following 3 values.
Attachments are the test cases for acos/asin in utests.

acos(-30.0):  gpu:-978164864.000000  cpu:nan
asin(-30.0):  gpu:978164864.000000  cpu:nan

acos(-1.0):       gpu:2.284487  cpu:3.141593
asin(-1.0):         gpu:-0.713690  cpu:-1.570796

acos(1):             gpu:0.284487  cpu:0.000000
asin(1):              gpu:1.286309  cpu:1.570796

Thanks
  --Sun, Yi

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