[Patch][LoopInfo] Use CGLoopInfo to generate loop hints

[Tyler Nowicki]

Hi Hal,

Here are the split patches.

Thanks,

Tyler

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> On Jun 22, 2015, at 5:40 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> 
> Hi Tyler,
> 
> -                            Type::getInt32Ty(Ctx), Attrs.VectorizerWidth))};
> +                            Type::getInt32Ty(Ctx), Attrs.VectorizeWidth))};
> 
> Could you please factor out the renamings from the functional change?
>>> 
>>> Hello,
>>> 
>>> I noticed a problem with my implementation of #pragma clang loop
>>> vectorize(assume_safety). When it was specified on a loop other
>>> loop hints were lost. The problem is that CGLoopInfo attaches
>>> metadata a little bit differently than EmitCondBrHints in CGStmt.
>>> For do-loops CGLoopInfo attaches metadata to the br in the body
>>> block and for while and for loops, the inc block. EmitCondBrHints
>>> on the other hand always attaches data to the br in the cond
>>> block. When specifying assume_safety CGLoopInfo emits an empty
>>> llvm.loop metadata shadowing the metadata in the cond block. Loop
>>> transformations like rotate and unswitch would then eliminate the
>>> cond block.
>>> 
>>> This patch unifies both approaches for adding metadata and modifies
>>> the existing safety tests to include non-assume_safety loop hints.