[Bug middle-end/54146] Very slow compile at -O1 (expand vars)

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54146

--- Comment #8 from Steven Bosscher <steven at gcc dot gnu.org> 2012-08-01 
14:14:11 UTC ---
With the attribute((flatten)) removed, the full test case compiles in less than
a minute.