[Bug c/113795] armv8.1m-m.main+pacbti -mbranch-protection=standard -O2 compile error

[keithp at keithp dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113795

--- Comment #1 from keithp at keithp dot com <keithp at keithp dot com> ---
compiler command:

arm-none-eabi-gcc \
    -std=c18 \
    -O2 \
    -mthumb \
    -march=armv8.1-m.main+pacbti+fp \
    -mbranch-protection=standard \
    -o \
    bar.s \
    -S \
    bar.c