i386: Use code_for_ instead of gen_ for parameterized names more.

i386: Use code_for_ instead of gen_ for parameterized names more.

Some builtins are better expanded to patterns with
parametrized names via code_for_ than gen_ helpers.

No functional changes.

2020-08-19  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	* config/i386/i386-expand.c (ix86_expand_builtin)
	[case IX86_BUILTIN_ENQCMD, case IX86_BUILTIN_ENQCMDS]:
	Rewrite expansion to use code_for_enqcmd.
	[case IX86_BUILTIN_WRSSD, case IX86_BUILTIN_WRSSQ]:
	Rewrite expansion to use code_for_wrss.
	[case IX86_BUILTIN_WRUSSD, case IX86_BUILTIN_WRUSSD]:
	Rewrite expansion to use code_for_wrss.