[PATCH] D47010: [NewGVN] Minor cleanups

[Daniel Berlin via llvm-commits]

>  Simplify handling of the false edge of branch predicates. We can handle
this the same way as the true edge with an inverted predicate. This is both
more general and simpler than the previous code.

I swear we have had an issue with an edge case that made this  not true in
the past, which is what led to the current code.

If you've actually 3 stage bootstrapped clang+llvm and tested this, i'm
okay with it for now.
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