Moved all the optimizations for |x| <= 9pi/2 from

__ieee754_rem_pio2f() to its 3 callers and manually inline them.

On Athlons, with favourable compiler flags and optimizations and
favourable pipeline conditions, this gives a speedup of 30-40 cycles
for cosf(), sinf() and tanf() on the range pi/4 < |x| <= 9pi/4, so
thes functions are now signifcantly faster than the hardware trig
functions in many cases.  E.g., in a benchmark with uniformly distributed
x in [-2pi, 2pi], A64 hardware fcos took 72-129 cycles and cosf() took
37-55 cycles.  Out-of-order execution is needed to get both of these
times.  The optimizations in this commit apparently work more by
removing 1 serialization point than by reducing latency.

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