Heejin Ahn 0af7542135 Reapply "[WebAssembly] Fix phi handling for Wasm SjLj (#99730)" ...

This reapplies #99730. #99730 contained a nondeterministic iteration
which failed the reverse-iteration bot
(https://lab.llvm.org/buildbot/#/builders/110/builds/474) and reverted
in
f3f0d9928f.

The fix is make the order of iteration of new predecessors
determintistic by using `SmallSetVector`.
```diff
--- a/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
@@ -1689,7 +1689,7 @@ void WebAssemblyLowerEmscriptenEHSjLj::handleLongjmpableCallsForWasmSjLj(
     }
   }

-  SmallDenseMap<BasicBlock *, SmallPtrSet<BasicBlock *, 4>, 4>
+  SmallDenseMap<BasicBlock *, SmallSetVector<BasicBlock *, 4>, 4>
       UnwindDestToNewPreds;
   for (auto *CI : LongjmpableCalls) {
     // Even if the callee function has attribute 'nounwind', which is true for
```

2024-07-25 00:00:59 +00:00

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