Rlease GCC ARM Embedded 4.8 update 3

Written for GNU Arm Embedded Toolchain by Terry Guo on 2014-09-30

The 4.8 2014q3 update release is ready at https://launchpad.net/gcc-arm-embedded/4.8/4.8-2014-q3-update and https://launchpad.net/~terry.guo/+archive/gcc-arm-embedded.

Features:
* Support the new cpu cortex-m7.

Important bugs fixed in 4.8 2014q3 update release:
* --var-info-path-expression fails for nested structs
  https://sourceware.org/bugzilla/show_bug.cgi?id=16084
* LTO ignores -fno-short-enums
  https://bugs.launchpad.net/gcc-arm-embedded/+bug/1315810

Recommend to update to this tool chain.