[Bug c/87400] GCC doesn't produce valid frames for stack traces with Thumb-2 (Cortex-M3+)

[alexkalmuk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87400

--- Comment #2 from Alex Kalmuk <alexkalmuk at gmail dot com> ---
I write about mtpcs-frame for thumb, not mapcs-frame, I know the last one for
arm instruction set.