[tree-ssa] Speedup alias analysis [patch]

[Chris Lattner]

Diego Novillo wrote:
> ADDR_EXPR is a funny operator.  If you expose it in the IL you may run
> into aliasing problems and the optimizers will likely mess things up.
...
> If we were to expose it into the IL we would have to teach the
> optimizers to treat it with care.  I'm not sure I want that.  This topic
> comes up every now and then.  We still haven't found a more gracious way
> of dealing with ADDR_EXPRs, unfortunately.

LLVM does not have an "address-of" operator in the language, and handles
all of the issues you brought up gracefully.  If you'd like to describe
how we handle these issues, I would be glad to...

-Chris

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