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6d4d017fd2
When `llvm-extract`-ing a function, and the `CG Profile` flag is present in the original module, we end up with lots of `!{null, null, i64 1234}` entries for call edges that have disappeared as result of the removed functions.
This patch fixes that by adding a pass to `llvm-extract` that finds `CG Profile` edges with one or both operands `null` and removes them. This results in a cleaner output.