gcc-4 -Og false positive "may be used uninitialised"

binutils/
	* readelf.c (dump_section_as_strings) Avoid false positive
	"may be used uninitialised".
gas/
	* config/tc-arm.c (move_or_literal_pool): Avoid false positive
	"may be used uninitialised".
	(opcode_lookup): Likewise.