re PR tree-optimization/81588 (Wrong code at -O2)

re PR tree-optimization/81588 (Wrong code at -O2)

	PR tree-optimization/81588
	* tree-ssa-reassoc.c (optimize_range_tests_var_bound): If
	ranges[i].in_p, invert comparison code ccode.  For >/>=,
	swap rhs1 and rhs2 and comparison code unconditionally,
	for </<= don't do that.  Don't swap rhs1/rhs2 again if
	ranges[i].in_p, instead invert comparison code ccode if
	opcode or oe->rank is BIT_IOR_EXPR.

	* gcc.dg/tree-ssa/pr81588.c: New test.
	* gcc.dg/pr81588.c: New test.
	* gcc.c-torture/execute/pr81588.c: New test.

From-SVN: r250760