powerpc: floor/floorf refactor

powerpc: floor/floorf refactor

This patches consolidates all the powerpc floor{f} implementations on
the generic sysdeps/powerpc/fpu/s_floor{f}.  The generic implementation
uses either the compiler builts for ISA 2.03+ (which generates the
frim instruction) or a generic implementation which uses FP only
operations.

The IFUNC organization for powerpc64 is also change to be enabled only
for powerpc64 and not for powerpc64le (since minium ISA of 2.08 does not
require the fallback generic implementation).

Checked on powerpc-linux-gnu (built without --with-cpu, with
--with-cpu=power4 and with --with-cpu=power5+ and --disable-multi-arch),
powerpc64-linux-gnu (built without --with-cp and with --with-cpu=power5+
and --disable-multi-arch).

	* sysdeps/powerpc/fpu/round_to_integer.h (set_fenv_mode):
	Add FLOOR option.
	(round_mode): Add definition for FLOOR.
	* sysdeps/powerpc/fpu/s_floor.c: New file.
	* sysdeps/powerpc/fpu/s_floorf.c: Likewise.
	* sysdeps/powerpc/powerpc32/fpu/s_floor.S: Remove file.
	* sysdeps/powerpc/powerpc32/fpu/s_floorf.S: Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floor-power5+.S:
	Remove file.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floor-ppc32.S:
	Likewise
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floorf-power5+.S:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floorf-ppc32.S:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floor-power5+.c:
	New file.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floor-ppc32.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floorf-power5+.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_floorf-ppc32.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power5+/fpu/s_floor.S: Remove file.
	* sysdeps/powerpc/powerpc32/power5+/fpu/s_floorf.S: Remove file.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
	(libm-sysdep_routines): Add s_floor-power5+, s_floor-ppc64,
	s_floorf-power5+, and s_floorf-ppc64.
	(CFLAGS-s_floor-power5+.c, CFLAGS-s_floorf-power5+.c): New rule.
	* sysdep/powerpc/powerpc64/be/fpu/multiarch/s_floor-power5+.c: New
	file.
	* sysdep/powerpc/powerpc64/be/fpu/multiarch/s_floor-ppc64.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_floor.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_floor.c: ... here.
	* sysdep/powerpc/powerpc64/be/fpu/multiarch/s_floorf-power5+.c: New
	file.
	* sysdep/powerpc/powerpc64/be/fpu/multiarch/s_floorf-ppc64.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_floorf.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_floorf.c: ... here.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
	(libm-sysdep_routines): Remove s_floor-power5+, s_floor-ppc64,
	s_floorf-power5+, and s_floorf-ppc64.
	* sysdep/powerpc/powerpc64/fpu/multiarch/s_floor-power5+.S: Remove
	file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_floor-ppc64.S: Remove
	file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_floorf-power5+.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_floorf-ppc64.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_floor.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_floorf.S: Likewise.
	* sysdeps/powerpc/powerpc64/power5+/fpu/s_floor.S: Likewise.
	* sysdeps/powerpc/powerpc64/power5+/fpu/s_floorf.S: Likewise.

Reviewed-by: Gabriel F. T. Gomes <gabriel@inconstante.eti.br>