[llvm] CodeGen: replace assertions with explicit errors for landinpad lowering (PR #71287)

[Matt Arsenault via llvm-commits]

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@@ -2795,9 +2795,13 @@ bool IRTranslator::translateLandingPad(const User &U,
   MIRBuilder.buildUndef(Undef);
 
   SmallVector<LLT, 2> Tys;
-  for (Type *Ty : cast<StructType>(LP.getType())->elements())
-    Tys.push_back(getLLTForType(*Ty, *DL));
-  assert(Tys.size() == 2 && "Only two-valued landingpads are supported");
+  if (LP.getType()->isStructTy()) {
+    for (Type *Ty : cast<StructType>(LP.getType())->elements())
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arsenm wrote:

dyn_cast instead of pre-check + cast 

https://github.com/llvm/llvm-project/pull/71287