auto merge of #6859 : thestinger/rust/optimize, r=thestinger

A workaround to get #6828 through.

Author: bors

src/librustc/back/passes.rs

@@ -134,7 +134,6 @@ pub fn create_standard_passes(level:OptLevel) -> ~[~str] {
     passes.push(~"correlated-propagation");
     passes.push(~"dse");
 
-    passes.push(~"bb-vectorize");
     passes.push(~"instcombine");
     passes.push(~"early-cse");