merging Tag_DIV_use, Tag_MPextension_use, and Tag_MPextension_use_legacy tags. * binutils/readelf.c (arm_attr_tag_Advanced_SIMD_arch): Add description of newly permitted attribute values. (arm_attr_tag_Virtualization_use): Likewise. (arm_attr_tag_DIV_use): Add description of new attribute. (arm_attr_tag_MPextension_use_legacy): Likewise. * gas/config/tc-arm.c (arm_convert_symbolic_attribute): Add Tag_DIV_use. * gas/doc/c-arm.texi: Likewise. * gas/testsuite/gas/arm/attr-order.d: Fix test for new names for attribute values. * include/elf/arm.h (Tag_MPextension_use): Renumber. (Tag_DIV_use): Add. (Tag_MPextension_use_legacy): Likewise. * ld/testsuite/ld-arm/attr-merge-3.attr: Fix test for new attribute values. * ld/testsuite/ld-arm/attr-merge-3b.s: Likewise. * ld/testsuite/ld-arm/attr-merge-unknown-1.d: Fix test now that 42 is a recognised attribute ID. * ld/testsuite/ld-arm/attr-merge-unknown-1.s: Likewise. * ld/testsuite/ld-arm/attr-merge-6.attr: New test. * ld/testsuite/ld-arm/attr-merge-6a.s: Likewise. * ld/testsuite/ld-arm/attr-merge-6b.s: Likewise. * ld/testsuite/ld-arm/attr-merge-7.attr: Likewise. * ld/testsuite/ld-arm/attr-merge-7a.s: Likewise. * ld/testsuite/ld-arm/attr-merge-7b.s: Likewise. * ld/testsuite/ld-arm/arm-elf.exp: Run the new tests.