[PING] Enable fuse-caller-save for ARM/Aarch64

[Tom de Vries]

Richard,

Ping for these patches:
- [PATCH, ARM] Enable fuse-caller-save for ARM
  https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00008.html
- [PATCH, AARCH64] Enable fuse-caller-save for AARCH64
  https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00004.html

The patches enable the -fuse-caller-save optimization for architectures ARM and
AARCH64.

Thanks,
- Tom