fold-const.c (build_range_check): Optimize (c>=1) && (c<=127) into the equivalent (signed char)c > 0.

	* fold-const.c (build_range_check): Optimize (c>=1) && (c<=127)
	into the equivalent (signed char)c > 0.

	* gcc.c-torture/execute/20020510-1.c: New test case.

From-SVN: r53373