Created attachment 807019 [details]
foo.i
gcc -m32 -c -o foo.o foo.i -fno-omit-frame-pointer -O2 -fverbose-asm
--save-temps
then look into .s
gcc-8:
if this is in: GOOD
# foo.i:49: case MODE_ID_ECB: str = (const WCHAR
[]){'C','h','a','i','n','i','n','g','M','o','d','e','E','C','B',0}; break;
with gcc-9 there is no trace of it.