Is there a way to dump LTO IR?

[H.J. Lu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64754

is a LTO bug where stage 1 and stage 2 compilers generate
different LTO IR.  Is there  a way to dump LTO IR to see the
actual difference in LTO IR?

Thanks.

-- 
H.J.