[SILGen]: Add test for parenthesized try expression

Author: saehejkang

test/SILGen/typed_throws.swift

@@ -315,3 +315,11 @@ class MySubclass: MyClass {
 class MySubsubclass: MySubclass {
   override func f() { }
 }
+
+// Check that SILGen does not crash because of a parenthesized try expression
+class Class {
+  var num: Int = 1
+
+  init() throws {}
+}
+_ = (try Class().num)