[PATCH v2, GCC, V8M 5/8][arm-embedded] ARMv8-M Security Extension's cmse_nonsecure_entry: clear registers

[Andre Vieira (lists)]

Applied the patch in
https://gcc.gnu.org/ml/gcc-patches/2016-03/msg01524.html on
embedded-5-branch at revision r234585.

Cheers,
Andre