Support IEEE 128-bit overload extract and insert built-in functions.

Support IEEE 128-bit overload extract and insert built-in functions.

This patch adds support for overloading the IEEE 128-bit extract and insert
built-in functions bewteeen KFmode and TFmode arguments.

2022-08-01   Michael Meissner  <meissner@linux.ibm.com>

gcc/

	* config/rs6000/rs6000-builtins.def
	(__builtin_vsx_scalar_extract_expq_kf): Rename KFmode IEEE 128-bit
	insert and extract built-in functions to have a KF suffix to allow
	overloading.
	(__builtin_vsx_scalar_extract_sigq_kf): Likewise.
	(__builtin_vsx_scalar_insert_exp_qp_kf): Likewise.
	(__builtin_vsx_scalar_extract_expq_tf): Add TFmode variants for IEEE
	128-bit insert and extract support.
	(__builtin_vsx_scalar_extract_sigq_tf): Likewise.
	(__builtin_vsx_scalar_insert_exp_qp_tf): Likewise.
	* config/rs6000/rs6000-c.cc (altivec_resolve_overloaded_builtin):
	Add support for having KFmode and TFmode variants of VSIEQPF.
	* config/rs6000/rs6000-overload.def (__builtin_vec_scalar_extract_exp):
	Add TFmode overloads.
	(__builtin_vec_scalar_extract_sig): Likewise.
	(__builtin_vec_scalar_insert_exp): Likewise.

gcc/testsuite/

	* gcc.target/powerpc/bfp/scalar-extract-exp-4.c:  Update the expected
	error message.
	* gcc.target/powerpc/bfp/scalar-extract-sig-4.c: Likewise.
	* gcc.target/powerpc/bfp/scalar-insert-exp-10.c: Likewise.