Move TRUE case first in range-op.cc.

Move TRUE case first in range-op.cc.

It's incredibly annoying that some of the BRS_TRUE cases come after
BRS_FALSE, if only because we're not consistent.  Having random
ordering increases the changes of thinkos when adapting the irange
code to floats.

gcc/ChangeLog:

	* range-op.cc (operator_equal::op1_range): Move BRS_TRUE case up.
	(operator_lt::op2_range): Same.
	(operator_le::op2_range): Same.
	(operator_gt::op2_range): Same.
	(operator_ge::op2_range): Same.