[Bug target/118089] [12/13/14/15 regression] arm thumb2 return sequence is suboptimal, especially at -O2

[rearnsha at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118089

--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Partially fixed.  Still to do is implementing stack deallocation by using a POP
of dead callee saved regs (for -Os).