i386: Improve LWP builtin expanders.

i386: Improve LWP builtin expanders.

Use parameterized pattern names to simplify calling of named patterns.

2020-08-14  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	* config/i386/i386-builtin.def (__builtin_ia32_llwpcb)
	(__builtin_ia32_slwpcb, __builtin_ia32_lwpval32)
	(__builtin_ia32_lwpval64, __builtin_ia32_lwpins32)
	(__builtin_ia32_lwpins64): Use CODE_FOR_nothing.
	* config/i386/i386.md (@lwp_llwpcb<mode>):
	Implement as parametrized name pattern.
	(@lwp_slwpcb<mode>): Ditto.
	(@lwp_lwpval<mode>): Ditto.
	(@lwp_lwpins<mode>): Ditto.
	* config/i386/i386-expand.c (ix86_expand_special_args_builtin)
	[case VOID_FTYPE_UINT_UINT_UINT, case VOID_FTYPE_UINT64_UINT_UINT]
	[case UCHAR_FTYPE_UINT_UINT_UINT, case UCHAR_FTYPE_UINT64_UINT_UINT]:
	Remove.
	(ix86_expand_builtin)
	[ case IX86_BUILTIN_LLWPCB, case IX86_BUILTIN_LLWPCB]:
	Update for parameterized name patterns.
	[case IX86_BUILTIN_LWPVAL32, case IX86_BUILTIN_LWPVAL64]
	[case IX86_BUILTIN_LWPINS32, case IX86_BUILTIN_LWPINS64]: Expand here.