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b34315963f
Summary: D77423 started using a dominator tree in WasmEHPrepare, but we deleted BBs in `prepareThrows` before we used the domtree in `prepareEHPads`, and those CFG changes were not reflected in the domtree. This uses `DomTreeUpdater` to make sure we update the domtree every time we delete BBs from the CFG. This fixes ubsan/msan/expensive_check errors caught in LLVM buildbots. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D77465
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