rs6000, remove duplicated built-ins of vecmergl and vec_mergeh

The following undocumented built-ins are same as existing documented
overloaded builtins.

  const vf __builtin_vsx_xxmrghw (vf, vf);
same as  vf __builtin_vec_mergeh (vf, vf);     (overloaded vec_mergeh)

  const vsi __builtin_vsx_xxmrghw_4si (vsi, vsi);
same as vsi __builtin_vec_mergeh (vsi, vsi);   (overloaded vec_mergeh)

  const vf __builtin_vsx_xxmrglw (vf, vf);
same as vf __builtin_vec_mergel (vf, vf);      (overloaded vec_mergel)

  const vsi __builtin_vsx_xxmrglw_4si (vsi, vsi);
same as vsi __builtin_vec_mergel (vsi, vsi);   (overloaded vec_mergel)

This patch removes the duplicate built-in definitions so only the
documented built-ins will be available for use.  The case statements in
rs6000_gimple_fold_builtin are removed as they are no longer needed.  The
patch removes the now unused define_expands for vsx_xxmrghw_<mode> and
vsx_xxmrglw_<mode>.

gcc/ChangeLog:
	* config/rs6000/rs6000-builtins.def (__builtin_vsx_xxmrghw,
	__builtin_vsx_xxmrghw_4si, __builtin_vsx_xxmrglw,
	__builtin_vsx_xxmrglw_4si, __builtin_vsx_xxsel_16qi): Remove
	built-in definition.
	* config/rs6000/rs6000-builtin.cc (rs6000_gimple_fold_builtin):
	remove case entries RS6000_BIF_XXMRGLW_4SI,
	RS6000_BIF_XXMRGLW_4SF, RS6000_BIF_XXMRGHW_4SI,
	RS6000_BIF_XXMRGHW_4SF.
	* config/rs6000/vsx.md (vsx_xxmrghw_<mode>, vsx_xxmrglw_<mode>):
	Remove unused define_expands.

0 files changed, 0 insertions, 0 deletions