(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.
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