[PATCH] Don't create instructions in CFLAliasAnalysis. NFC

[George Burgess IV]

LGTM

- George

> On Jun 11, 2015, at 1:24 AM, Pete Cooper <peter_cooper at apple.com> wrote:
> 
> Hi Hal, George
> 
> The CFLAA code currently calls ConstantExpr::getAsInstruction which creates an instruction from a constant expr.
> 
> We then pass that instruction to the InstVisitor to analyze it.
> 
> Its not necessary to create these instructions as we can just cast from Constant to Operator in the visitor.  This is how other InstVisitor’s such as SelectionDAGBuilder handle ConstantExpr.
> 
> This should provide a small speed improvement to this pass, but i’m actually doing this as an effort to devirtualize Value.  This just happened to come up in that patch sequence.
> 
> Cheers,
> Pete
> 
> <cfl.patch>