* gas/config/tc-arm.c (arm_ext_adiv): New variable.

	* gas/config/tc-arm.c (arm_ext_adiv): New variable.
	(do_div): New function.
	(insns): Accept UDIV and SDIV in ARM state.
	(arm_cpus): The cortex-a15 option has all current v7-A extensions.
	(arm_extensions): Add 'idiv' extension.
	(aeabi_set_public_attributes): Update Tag_DIV_use values for the
	Integer Divide extension.
	* gas/doc/c-arm.texi: Document the idiv extension.
	* gas/testsuite/gas/arm/armv7-a+idiv.d: New test.
	* gas/testsuite/gas/arm/armv7-a+idiv.s: Likewise.
	* gas/testsuite/gas/arm/attr-march-all.d: Update for Integer divide extension.
	* gas/testsuite/gas/arm/attr-march-armv7-a+idiv.d: New test.
	* include/opcode/arm.h (ARM_AEXT_ADIV): New define.
	(ARM_ARCH_V7A_IDIV_MP_SEC): Likewise.
	* opcodes/arm-dis.c (arm_opcodes): Support disassembly of UDIV and SDIV in
	ARM state.