[clang] [llvm] [WebAssembly] Implement an alternative translation for -wasm-enable-sjlj (PR #84137)

[Heejin Ahn via cfe-commits]

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@@ -1738,10 +1792,16 @@ void WebAssemblyLowerEmscriptenEHSjLj::handleLongjmpableCallsForWasmSjLj(
   BasicBlock *ThenBB = BasicBlock::Create(C, "if.then", &F);
   BasicBlock *EndBB = BasicBlock::Create(C, "if.end", &F);
   Value *EnvP = IRB.CreateBitCast(Env, getAddrPtrType(&M), "env.p");
-  Value *SetjmpID = IRB.CreateLoad(getAddrIntType(&M), EnvP, "setjmp.id");
-  Value *Label =
-      IRB.CreateCall(TestSetjmpF, {SetjmpID, SetjmpTable, SetjmpTableSize},
-                     OperandBundleDef("funclet", CatchPad), "label");
+  Value *Label;
+  if (EnableWasmAltSjLj) {
+    Label = IRB.CreateCall(TestSetjmpF, {EnvP, SetjmpTable},
+                           OperandBundleDef("funclet", CatchPad), "label");
+  } else {
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aheejin wrote:

The reason I added all setjmp instructions in `SetjmpTableInsts` was to do the SSA update. Now we have a single `setjmpTable`, we don't need to do it and we don't need `SetjmpTableInsts`. (Sorry I missed this comment before)

https://github.com/llvm/llvm-project/pull/84137