[Bug middle-end/18927] O(n^2) compile time with -O0 (n= number of basic blocks) in global alloc

[pinskia at gcc dot gnu dot org]

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           What    |Removed                     |Added
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          Component|target                      |middle-end
           Keywords|                            |compile-time-hog


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18927