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fix(math): restore pi_lo in atan2f for x < 0

musl and FreeBSD atan2f return pi - (z - pi_lo) and (z - pi_lo) - pi
when x < 0, where pi_lo is the part of pi that the Float constant
cannot hold. #2739 removed pi_lo while fixing the quadrant II result,
which came from atanf(y / x) instead of atanf(|y / x|); that fix stays.

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