rs6000: Rename functions with "new" in their names

While we had two sets of built-in functionality at the same time, I put "new"
in the names of quite a few functions.  Time to undo that.

2021-12-02  Bill Schmidt  <wschmidt@linux.ibm.com>

gcc/
	* config/rs6000/rs6000-c.c (altivec_resolve_new_overloaded_builtin):
	Remove forward declaration.
	(rs6000_new_builtin_type_compatible): Rename to
	rs6000_builtin_type_compatible.
	(rs6000_builtin_type_compatible): Remove.
	(altivec_resolve_overloaded_builtin): Remove.
	(altivec_build_new_resolved_builtin): Rename to
	altivec_build_resolved_builtin.
	(altivec_resolve_new_overloaded_builtin): Rename to
	altivec_resolve_overloaded_builtin.  Remove static keyword.  Adjust
	called function names.
	* config/rs6000/rs6000-call.c (rs6000_expand_new_builtin): Remove
	forward declaration.
	(rs6000_gimple_fold_new_builtin): Likewise.
	(rs6000_invalid_new_builtin): Rename to rs6000_invalid_builtin.
	(rs6000_gimple_fold_builtin): Remove.
	(rs6000_new_builtin_valid_without_lhs): Rename to
	rs6000_builtin_valid_without_lhs.
	(rs6000_new_builtin_is_supported): Rename to
	rs6000_builtin_is_supported.
	(rs6000_gimple_fold_new_mma_builtin): Rename to
	rs6000_gimple_fold_mma_builtin.
	(rs6000_gimple_fold_new_builtin): Rename to
	rs6000_gimple_fold_builtin.  Remove static keyword.  Adjust called
	function names.
	(rs6000_expand_builtin): Remove.
	(new_cpu_expand_builtin): Rename to cpu_expand_builtin.
	(new_mma_expand_builtin): Rename to mma_expand_builtin.
	(new_htm_spr_num): Rename to htm_spr_num.
	(new_htm_expand_builtin): Rename to htm_expand_builtin.  Change name
	of called function.
	(rs6000_expand_new_builtin): Rename to rs6000_expand_builtin.  Remove
	static keyword.  Adjust called function names.
	(rs6000_new_builtin_decl): Rename to rs6000_builtin_decl.  Remove
	static keyword.
	(rs6000_builtin_decl): Remove.
	* config/rs6000/rs6000-gen-builtins.c (write_decls): In gnerated code,
	rename rs6000_new_builtin_is_supported to rs6000_builtin_is_supported.
	* config/rs6000/rs6000-internal.h (rs6000_invalid_new_builtin): Rename
	to rs6000_invalid_builtin.
	* config/rs6000/rs6000.c (rs6000_new_builtin_vectorized_function):
	Rename to rs6000_builtin_vectorized_function.
	(rs6000_new_builtin_md_vectorized_function): Rename to
	rs6000_builtin_md_vectorized_function.
	(rs6000_builtin_vectorized_function): Remove.
	(rs6000_builtin_md_vectorized_function): Remove.