[Bug target/77904] [ARM Cortex-M0] Frame pointer thrashes registers if assembly statements with "sp" clobber are used

[freddie_chopin at op dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77904

--- Comment #7 from Freddie Chopin <freddie_chopin at op dot pl> ---
Could this be also backported to the gcc-6 branch? I guess there will be 6.3
version (possibly before first 7.x version), so it would be nice to have this
patch there (;