i386: Do not use commutative operands with (use) RTX [PR95238]

2020-05-21  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:
	PR target/95218

	* config/i386/mmx.md (*mmx_<code>v2sf): Do not mark
	operands 1 and 2 commutative.  Manually swap operands.
	(*mmx_nabsv2sf2): Ditto.

	Partially revert:

	* config/i386/i386.md (*<code>tf2_1):
	Mark operands 1 and 2 commutative.
	(*nabstf2_1): Ditto.
	* config/i386/sse.md (*<code><mode>2): Mark operands 1 and 2
	commutative.  Do not swap operands.
	(*nabs<mode>2): Ditto.