rs6000, remove vector set and vector init built-ins.

The vector init built-ins:

  __builtin_vec_init_v16qi, __builtin_vec_init_v8hi,
  __builtin_vec_init_v4si, __builtin_vec_init_v4sf,
  __builtin_vec_init_v2di, __builtin_vec_init_v2df,
  __builtin_vec_init_v1ti

perform the same operation as initializing the vector in C code.  For
example:

  result_v4si = __builtin_vec_init_v4si (1, 2, 3, 4);
  result_v4si = {1, 2, 3, 4};

These two constructs were tested and verified they generate identical
assembly instructions with no optimization and -O3 optimization.

The vector set built-ins:

  __builtin_vec_set_v16qi, __builtin_vec_set_v8hi.
  __builtin_vec_set_v4si, __builtin_vec_set_v4sf,
  __builtin_vec_set_v1ti, __builtin_vec_set_v2di,
  __builtin_vec_set_v2df

perform the same operation as setting a specific element in the vector in
C code.  For example:

  src_v4si = __builtin_vec_set_v4si (src_v4si, int_val, index);
  src_v4si[index] = int_val;

The built-in actually generates more instructions than the inline C code
with no optimization but is identical with -O3 optimizations.

All of the above built-ins that are removed do not have test cases and
are not documented.

Built-ins __builtin_vec_set_v1ti __builtin_vec_set_v2di,
__builtin_vec_set_v2df are not removed as they are used in function
resolve_vec_insert() in file rs6000-c.cc.

The built-ins are removed as they don't provide any benefit over just
using C code.

The code to define the bif_init_bit, bif_is_init, as well as their uses
are removed.  The function altivec_expand_vec_init_builtin is also removed.

gcc/ChangeLog:
	* config/rs6000/rs6000-builtin.cc (altivec_expand_vec_init_builtin):
	Remove the function.
	(rs6000_expand_builtin): Remove the if bif_is_int check to call
	the altivec_expand_vec_init_builtin function.
	* config/rs6000/rs6000-builtins.def: Remove the attribute string
	comment for init.
	(__builtin_vec_init_v16qi,
	__builtin_vec_init_v4sf, __builtin_vec_init_v4si,
	__builtin_vec_init_v8hi, __builtin_vec_init_v1ti,
	__builtin_vec_init_v2df, __builtin_vec_init_v2di,
	__builtin_vec_set_v16qi, __builtin_vec_set_v4sf,
	__builtin_vec_set_v4si, __builtin_vec_set_v8hi): Remove
	built-in definitions.
	* config/rs6000/rs6000-gen-builtins.cc: Remove comment for init
	attribute string.
	(struct attrinfo): Remove isinit entry.
	(parse_bif_attrs): Remove the if statement to check for attribute
	init.
	(ifdef DEBUG): Remove print for init attribute string.
	(write_decls): Remove print for define bif_init_bit and
	define for bif_is_init.
	(write_bif_static_init): Remove if bifp->attrs.isinit statement.

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