[Bug ipa/66896] ipa-prop.c:2479 runtime error: member call on null pointer of type 'struct ipa_polymorphic_call_context'

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66896

--- Comment #9 from Vittorio Zecca <zeccav at gmail dot com> ---
At line 2473 of ipa-prop.c I have

if (!ctx.useless_p ())
I changed it into 

if (!ctx.useless_p () || !dst_ctx)

Now the sanitizer runtime error message disappears.
I am attaching another source, gccerr20-bis.C, that used to force
update_jump_functions_after_inlining to reference a NULL pointer dst_ctx