Support TI mode and soft float on PA64

Support TI mode and soft float on PA64

This change implements TI mode on PA64.  Various new patterns are
added to pa.md.  The libgcc build needed modification to build both
DI and TI routines.  We also need various softfp routines to
convert to and from TImode.

I added full softfp for the -msoft-float option.  At the moment,
this doesn't completely eliminate all use of the floating-point
co-processor.  For this, libgcc needs to be built with -msoft-mult.
The floating-point exception support also needs a soft option.

2021-11-05  John David Anglin  <danglin@gcc.gnu.org>

	PR libgomp/96661

gcc/ChangeLog:

	* config/pa/pa-modes.def: Add OImode integer type.
	* config/pa/pa.c (pa_scalar_mode_supported_p): Allow TImode
	for TARGET_64BIT.
	* config/pa/pa.h (MIN_UNITS_PER_WORD) Define to MIN_UNITS_PER_WORD
	to UNITS_PER_WORD if IN_LIBGCC2.
	* config/pa/pa.md (addti3, addvti3, subti3, subvti3, negti2,
	negvti2, ashlti3, shrpd_internal): New patterns.
	Change some multi instruction types to multi.

libgcc/ChangeLog:

	* config.host (hppa*64*-*-linux*): Revise tmake_file.
	(hppa*64*-*-hpux11*): Likewise.
	* config/pa/sfp-exceptions.c: New.
	* config/pa/sfp-machine.h: New.
	* config/pa/t-dimode: New.
	* config/pa/t-softfp-sfdftf: New.