[Bug middle-end/46510] [4.6 Regression] r166812 breaks bootstrap on x86_64-apple-darwin10

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46510

--- Comment #20 from Jack Howarth <howarth at nitro dot med.uc.edu> 2010-11-21 
17:20:40 UTC ---
Created attachment 22477
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22477
backtrace for patch proposed in comment 17