[Bug sanitizer/64289] ICE with -fsanitize=float-cast-overflow

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64289

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 34267
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34267&action=edit
gcc5-pr64289.patch

Untested fix.