Rlease GCC ARM Embedded 4.9

Written for GNU Arm Embedded Toolchain by Terry Guo on 2014-12-10

The first 4.9 released is ready at https://launchpad.net/gcc-arm-embedded/4.9/4.9-2014-q4-major and https://launchpad.net/~terry.guo/+archive/gcc-arm-embedded.

Features and Important bug fixes are:

Features:
* All GCC 4.9 features, plus latest mainline features
  - Cortex-M7 support
  - Small multiply support with options:
    . -mcpu=cortex-m1.small-multiply
    . -mcpu=cortex-m0.small-multiply
    . -mcpu=cortex-m0plus.small-multiply
* Define aeabi_memcpy and aeabi_memcpy4 routines in newlib.
* Thumb-1 library optimizations.
* Additional code size optimizations
* Add gdb python build (arm-none-eabi-gdb-py).
* Object file without attribute section can be linked with any
  others.

Important bugs fixed in 4.9 major release:
* LTO ignores -fno-short-enums
  https://bugs.launchpad.net/gcc-arm-embedded/+bug/1315810
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61123

* Incorrect folding of bitfield in a union on big endian targets
  https://bugs.launchpad.net/gcc-arm-embedded/+bug/1330388
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62103

* newlib-nano printf("%.*s",moo) walks off the end of string
  https://bugs.launchpad.net/gcc-arm-embedded/+bug/1385829

Recommend to upgrade to this release.