[Bug target/72103] ICE with gcc 7 for povray benchmark

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72103

--- Comment #9 from Alan Modra <amodra at gmail dot com> ---
I looked, and decided there wasn't much we could do.  So the main nastiness in
the sequence is the mem store/load, but that is just reload running out of regs
and spilling.  Yes, it looks really dumb when viewing the assembly but not so
obvious to fix in reload.

Also, I didn't show that there is a use of the int value (r9) later.  That
makes xvcvdpsxws, xvcvsxwdp not so good.