[EH] Fix delegating to caller when func result is concrete

[aheejin]

hen the function return type is concrete, the translation result of a try-delegate that targets the caller includes a return that returns the whole function body:

binaryen/src/passes/TranslateEH.cpp

Lines 751 to 763 in 219e668

	// If sometype (func's type) is concrete:
	// (throw_ref
	// (block $caller_delegate_br_target (result exnref)
	// (return
	// ...
	// (try_table (catch_all_ref $caller_delegate_br_target)
	// ...
	// )
	// ...
	// )
	// )
	// )
	// )

We should do that based on the function's return type, not the function body's return type. The previous code didn't handle the case where the function's return type is concrete but the function body's return type is unreachable.