[Bug rtl-optimization/51447] [4.6/4.7 Regression] global register variable definition incorrectly removed as dead code

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51447

--- Comment #17 from Jack Howarth <howarth at nitro dot med.uc.edu> 2013-01-21 14:52:35 UTC ---
The failure in comment 16 appears to be PR51784.