[llvm] Clean backport of upstream PR183272 - #23284

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Commits on Sep 7, 2026

Reapply "[ORC] Simplify WaitingOnGraph::Coalescer::remove."

lhames
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hahnjo
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2c643e9
[ORC] WaitingOnGraph perf: faster dependence propagation.

lhames
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hahnjo
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cf31254