[Bug middle-end/43316] fold check: original tree changed by fold

[d.g.gorbachev at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43316

--- Comment #3 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> 
2010-11-20 15:27:30 UTC ---
Still fails with GCC 4.6.0 20101113.