Release GCC ARM Embedded 6 major

Written for GNU ARM Embedded Toolchain by Andre Vieira on 2016-12-21

The 6 2016q4 major release is available at:
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* https://developer.arm.com/open-source/gnu-toolchain/gnu-rm
* https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa

IMPORTANT NOTICE: As previously announced we are no longer releasing the binary packages of this toolchain on Launchpad, please see the link for developer.arm.com above.

New Features
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Features:
* All GCC 6 features, plus latest mainline features:
  + Full ARMv8-M support including atomics and Security Extensions
  + ARM PURECODE support for ARMv7-M and ARMv8-M Mainline
  + Co-processor intrinsics support
  + Cortex-M23 and Cortex-M33 support
  + -mthumb optional for Cortex-M devices

Important bugs fixed in 6 major release:
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* Fix redundant load in loop
  https://answers.launchpad.net/gcc-arm-embedded/+question/259553
* Fixed stack corruption when using high registers and LR register
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77933
* Fixed internal compiler error when compiling empty FIQ interrupt handler
  https://bugs.launchpad.net/gcc-arm-embedded/+bug/1454506
* Fix internal compiler error with LTO when building g++.dg/lto/20081219 testcase
* Fixed callee-saved register trashing when clobbering SP register
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77904
* Fixed internal compiler error when using -mslow-flash-data and floating-point
  operations
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71607
* Fixed wrong code generation with indirect sibbling calls
  https://bugs.launchpad.net/gcc-arm-embedded/+bug/1616992
* Fixed spurious code removal
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78617

Known Changes and Issues
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* Windows wildcard support missing
* Thumb1 code size regression due to new register allocation:
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59535
* Multilib is now enabled with --with-multilib-list=rmprofile when building the
  toolchain from source

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