Allow all types supported by ranger in loop-ch.

Allow all types supported by ranger in loop-ch.

This converts the ranger use in loop-ch to allow any types allowed by
the ranger infrastructure.  Since the range of a GIMPLE_COND is always an
integer we can remove the check because the only temporary is already
an int_range.

gcc/ChangeLog:

	* tree-ssa-loop-ch.cc (entry_loop_condition_is_static): Remove
	irange::supports_p.