[Bug c/63795] ipa-icf ICE with noreturn functions (test case builtin-noret-1.c)

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63795

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
One of the many fall out of the IPA_ICF commit:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63622#c7. The ICE disappears if
you compile with -fno-ipa-icf.