[Bug c++/120955] [15/16 Regression] 50 % increase in data segment size on avr-gcc for -Os

[fiesh at zefix dot tv via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120955

--- Comment #1 from fiesh at zefix dot tv ---
12de1942a0a is r15-6052-g12de1942a0a673