Sign-extend start and stop address inputs to objdump

Sign-extend start and stop address inputs to objdump

For targets that treat addresses as signed (MIPS/SH64), user-specified
start/stop address limits cannot be compared directly to section VMAs.
We must sign-extend user-specified 32-bit address limits which have
bit 31 set for such targets.

binutils/
	* objdump.c (sign_extend_address): New function.
	(dump_bfd): Sign-extend user-specified start/stop addresses
	for targets that need it.
	* testsuite/binutils-all/objdump.exp: Add tests for objdump
	with start and stop addresses in higher address ranges.