[Bug rtl-optimization/64815] ICE caused by volatile_refs_p doesn't skip NULL operand

[terry.guo at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64815

--- Comment #2 from Terry Guo <terry.guo at arm dot com> ---
(In reply to Andrew Pinski from comment #1)
> I don't think you need to call volatile_refs_p on the notes part of the
> instruciton.

The volatile_refs_p works in a recursive way which makes itself to scan the
notes part. I just call volatile_refs_p to the insn.

Do you mean I should update volatile_refs_p to avoid recursively scanning the
notes part of the insn?