- Update to binutils 2.27.
  * Add a configure option, --enable-64-bit-archive, to force use of a
    64-bit format when creating an archive symbol index.
  * Add --elf-stt-common= option to objcopy for ELF targets to control
    whether to convert common symbols to the STT_COMMON type.
  GAS:
  * Default to --enable-compressed-debug-sections=gas for Linux/x86 targets.
  * Add --no-pad-sections to stop the assembler from padding the end of output
    sections up to their alignment boundary.
  * Support for the ARMv8-M architecture has been added to the ARM port.
    Support for the ARMv8-M Security and DSP Extensions has also been added
    to the ARM port.
  * ARC backend accepts .extInstruction, .extCondCode, .extAuxRegister, and
    .extCoreRegister pseudo-ops that allow an user to define custom
    instructions, conditional codes, auxiliary and core registers.
  * Add a configure option --enable-elf-stt-common to decide whether ELF
    assembler should generate common symbols with the STT_COMMON type by
    default.  Default to no.
  * New command line option --elf-stt-common= for ELF targets to control
    whether to generate common symbols with the STT_COMMON type.
  * Add ability to set section flags and types via numeric values for ELF
    based targets.
  * Add a configure option --enable-x86-relax-relocations to decide whether
    x86 assembler should generate relax relocations by default.  Default to
    yes, except for x86 Solaris targets older than Solaris 12.
  * New command line option -mrelax-relocations= for x86 target to control
    whether to generate relax relocations.
  * New command line option -mfence-as-lock-add=yes for x86 target to encode
    lfence, mfence and sfence as "lock addl $0x0, (%[re]sp)".
  * Add assembly-time relaxation option for ARC cpus.

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