sjlj-exceptions ICE. simplified test case

[Robert Lipe]

robertl> ICE I reported earlier in the week.  I've verified that it also
robertl> fails on i686-pc-linux.  To reproduce, invoke cc1plus with '-O2
robertl> -sjlj-exceptions'.

zack> I wonder if this bug is related to g++.eh/crash3.C, which is also
zack> a -fsjlj-exceptions ICE (in a totally different place) and has
zack> been broken for at least two months.

It's been at least two months since I've seen a full bootstrap (that
wasn't coddled with BOOT_CFLAGS) on my sjlj target so I am afraid I
can't pinpoint the exact breakage.

RJL