i386: Mark some of strict_low_part insn constraints earlyclobbered

i386: Mark some of strict_low_part insn constraints earlyclobbered

While there is practically impossible that input registers are matched
with in-out register, better mark the output operand of the split alternative
as earlyclobbered - we do output early to the output operand when
the insn is split.

2022-01-14  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	* config/i386/i386.md (*add<mode>_1_slp"):
	Mark alternative 1 output operand earlyclobbered.
	(*sub<mode>_1_slp): Ditto.
	(*and<mode>_1_slp): Ditto.
	(*<code><mode>_1_slp): Ditto.
	(*neg<mode>_1_slp): Ditto.
	(*one_cmpl<mode>_1_slp): Ditto.
	(*ashl<mode>3_1_slp): Ditto.
	(*<insn><mode>3_1_slp): Ditto.
	(*<insn><mode>3_1_slp): Ditto.