[llvm] r189858 - Enable late-vectorization by default.

[Nadav Rotem]

Hi Hal,

>> 
>> Regressions:
>> SingleSource/Benchmarks/Misc/lowercase  15.10%
>> MultiSource/Benchmarks/TSVC/Equivalencing-flt/Equivalencing-flt
>> 13.18%
>> SingleSource/Benchmarks/Shootout-C++/matrix 8.27%
>> SingleSource/Benchmarks/CoyoteBench/lpbench 7.30%
> 
> Do we understand anything about these? I'm specifically curious why the Shootout/matrix was helped so much while Shootout-C++/matrix was hurt?
> 

I am not sure. I am now starting the analysis of these benchmarks. 

Thanks,
Nadav




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