or1k: only force reg for immediates

or1k: only force reg for immediates

The force_reg in or1k_expand_compare is hard coded for SImode, which is fine as
this used to only be used on SI expands.  However, with FP support this will
cause issues.  In general we should only force the right hand operand to a
register if its an immediate.  This patch adds an condition to check for that.

gcc/ChangeLog:

	* config/or1k/or1k.c (or1k_expand_compare): Check for int before
	force_reg.

From-SVN: r273651