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avr-gcc 10.2

FEATURE_FLAGS = -fshort-enums -fpack-struct -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -flto -fno-fat-lto-objects
   text    data     bss     dec     hex filename
 231286    6306   42409  280001   445c1 main.elf

FEATURE_FLAGS = -ffunction-sections -fdata-sections -flto -fno-split-wide-types
   text    data     bss     dec     hex filename
 224770    6318   42415  273503   42c5f main.elf

avr-gcc 9.3

FEATURE_FLAGS = -fshort-enums -fpack-struct -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -flto -fno-fat-lto-objects
   text    data     bss     dec     hex filename
 230984    6088   42409  279481   443b9 main.elf

FEATURE_FLAGS = -ffunction-sections -fdata-sections -flto -fno-split-wide-types
   text    data     bss     dec     hex filename
 226060    6100   42415  274575   4308f main.elf

avr-gcc 8.3

FEATURE_FLAGS = -fshort-enums -fpack-struct -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -flto -fno-fat-lto-objects
   text    data     bss     dec     hex filename
 217344    6014   42409  265767   40e27 main.elf

FEATURE_FLAGS = -ffunction-sections -fdata-sections -flto -fno-split-wide-types
   text    data     bss     dec     hex filename
 218016    6026   42415  266457   410d9 main.elf

avr-gcc 7.3 (Arduino)

FEATURE_FLAGS = -fshort-enums -fpack-struct -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -flto -fno-fat-lto-objects
   text    data     bss     dec     hex filename
 217670    6018   42409  266097   40f71 main.elf

FEATURE_FLAGS = -ffunction-sections -fdata-sections -flto -fno-split-wide-types
   text    data     bss     dec     hex filename
 218312    6030   42415  266757   41205 main.elf

There is some discussion that 8.2+ produces more optimized code for interrupts by introducing pseduo-instructions. https://sourceware.org/bugzilla/show_bug.cgi?id=21683#c4