[Bug tree-optimization/70128] Linux kernel div patching optimized away

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70128

--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
Shouldn't the call to v7_coherent_kern_range prevent DSE from removing the
store to fn_addr[0] and fn_addr[1]?

It feels like the undefined nature of this code is leading to a lack of proper
dataflow for the virtual operands.   I haven't thrown it under a debugger, but
that's how it seems as first glance to me.