regression on Adobe-C++/loop_unroll

[Gerolf Hoflehner]

Hi Chandler

your commit seems to cause a major regression (>20%)  on loop_unroll and other benchmarks as well. This is ( at least)  on x86 under -O3 -flto and seems to be due to the loss of LICM. Please take a look.

Cheers
Gerolf

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r200067 | chandlerc | 2014-01-24 20:07:24 -0800 (Fri, 24 Jan 2014) | 44 lines

[LPM] Make LCSSA a utility with a FunctionPass that applies it to all
the loops in a function, and teach LICM to work in the presance of
LCSSA.

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