[llvm-commits] [patch] Use the new edge dominance functions in GVN

[Rafael Espíndola]

The attached patch depends on my previous one fixing the handling of
multiple edges between two basic blocks.

What this patch does is change GVN to use the new edge dominance
functions so that it is able to reason about an edge dominating a use.
With this patch in, fixing pr13307 becomes an issues of having logic
to decide if is more profitable to replace 'a' with 'b' or 'b' with
'a'.

Cheers,
Rafael
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