[Issue 19732] New: make std.complex.expi fast.

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https://issues.dlang.org/show_bug.cgi?id=19732

          Issue ID: 19732
           Summary: make std.complex.expi fast.
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nob...@puremagic.com
          Reporter: basti...@veelo.net

std.math.expi is deprecated, one is advised to use std.complex.expi instead.
But, unlike the former, std.complex.expi does not make use of fsincos[1] when
available.

(And it's documentation refers to deprecated std.math.expi for a faster
implementation, which is a bit silly.)

[1]
https://github.com/dlang/phobos/blob/d28a879fecbb7b478e660541bc94c402d38c913d/std/math.d#L3214

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