Backport parallel marking #27
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It's possible for PiNodes to effectively imply statically the condition
of a Core.ifelse. For example:
```julia
23 ─ %60 = Core.ifelse(%47, false, true)::Bool
│ %61 = Core.ifelse(%47, %58, false)::Union{Missing, Bool}
25 ─ goto #27 if not %60
26 ─ %65 = π (%61, Bool)
└─── ...
```
In basic block #26, the PiNode gives us enough information to conclude
that `%47 === false` if control flow reaches that point. The previous
code incorrectly assumed that this kind of pruning would only be done
for PhiNodes.
Resolves JuliaLang#50276
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Apparently we can't use slashes on branch names with the latest changes in the backport process. Will close this PR and open a new one with a different branch name. |
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Backport of JuliaLang's multithreaded GC (parallel marking).
X-ref: JuliaLang#48600.