As far as I can tell, this just duplicates the logic of context
specialization
in the graph builder. The only advantage here I see is that it avoids
inserting
a branch that would be immediately optimized away after the first round of
context specialization + control reduction.
Have you observed a case where the existing context specialization + control
reduction doesn't work?
https://codereview.chromium.org/967093002/
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