i386: Do not constrain fmod and remainder patterns with flag_finite_math_only [PR108922]

According to Intel ISA manual, fprem and fprem1 return NaN when invalid
arithmetic exception is generated. This is documented in Table 8-10 of the
ISA manual and makes these two instructions fully IEEE compatible.

The reverted patch was based on the data from table 3-30 and 3-31 of the
Intel ISA manual, where results in case of st(0) being infinity or
st(1) being 0 are not specified.

2023-02-27  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/108922
	Revert:
	* config/i386/i386.md (fmodxf3): Enable for flag_finite_math_only only.
	(fmod<mode>3): Ditto.
	(fpremxf4_i387): Ditto.
	(reminderxf3): Ditto.
	(reminder<mode>3): Ditto.
	(fprem1xf4_i387): Ditto.