[PPC64][VSX] Add a couple of new data types for vec_vsx_ld and vec_vsx_st...

[PPC64][VSX] Add a couple of new data types for vec_vsx_ld and vec_vsx_st intrinsics and fix incorrect testcases with minor refactoring

New added data types:
  vector double vec_vsx_ld (int, const double *);
  vector float vec_vsx_ld (int, const float *);
  vector bool short vec_vsx_ld (int, const vector bool short *);
  vector bool int vec_vsx_ld (int, const vector bool int *);
  vector signed int vec_vsx_ld (int, const signed int *);
  vector unsigned int vec_vsx_ld (int, const unsigned int *);

  void vec_vsx_st (vector double, int, double *);
  void vec_vsx_st (vector float, int, float *);
  void vec_vsx_st (vector bool short, int, vector bool short *);
  void vec_vsx_st (vector bool short, int, signed short *);
  void vec_vsx_st (vector bool short, int, unsigned short *);
  void vec_vsx_st (vector bool int, int, vector bool int *);
  void vec_vsx_st (vector bool int, int, signed int *);
  void vec_vsx_st (vector bool int, int, unsigned int *);

Also fix testcases which use non-vector argument version of vec_vsx_ld or
vec_vsx_st, but pass incorrect parameter.

llvm-svn: 266166