[llvm] [WebAssembly] Support type checker for new EH (PR #111069)

[Heejin Ahn via llvm-commits]

================
@@ -24,7 +24,6 @@ eh_test:
         return
       end_block
       throw_ref
-      drop
----------------
aheejin wrote:

After `throw_ref`, the stack is polymorphic, so you don't need to drop the `i32`

https://github.com/llvm/llvm-project/pull/111069