[EH] Support try-delegate in EffectAnalyzer (#4368)

This adds support for try-delegate in `EffectAnalyzer`. Without this
support, the expresion below has been incorrectly classified as "cannot
throw", because the previous code considered everything inside
`try`-`catch_all` as "cannot throw". This is not the case when there is
a `delegate` that can bypass the `catch_all`.
```wasm
try $l0
  try
    try
      throw $e
    delegate $l0
  catch_all
  end
end

1 files changed, 1 insertions, 1 deletions

diff --git a/src/passes/Vacuum.cpp b/src/passes/Vacuum.cpp
index abd54f334..6adab04e9 100644
--- a/src/passes/Vacuum.cpp
+++ b/src/passes/Vacuum.cpp
@@ -360,7 +360,7 @@ struct Vacuum : public WalkerPass<ExpressionStackWalker<Vacuum>> {
   void visitTry(Try* curr) {
     // If try's body does not throw, the whole try-catch can be replaced with
     // the try's body.
-    if (!EffectAnalyzer(getPassOptions(), *getModule(), curr->body).throws) {
+    if (!EffectAnalyzer(getPassOptions(), *getModule(), curr->body).throws()) {
       replaceCurrent(curr->body);
       for (auto* catchBody : curr->catchBodies) {
         typeUpdater.noteRecursiveRemoval(catchBody);