[DebugInfo] Add a test case for classes with -gdwarf-types

Author: augusto2112

test/DebugInfo/classes.swift

@@ -0,0 +1,15 @@
+// RUN: %target-swift-frontend -primary-file %s -emit-ir -gdwarf-types -o - | %FileCheck %s
+
+class SomeClass {
+  let first = 4
+  let second = "Hello"
+}
+
+// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "SomeClass", 
+// CHECK-SAME: size: 64, elements: 
+// CHECK-SAME: runtimeLang: DW_LANG_Swift, identifier: "$s7classes9SomeClassCD")
+
+// CHECK: !DIDerivedType(tag: DW_TAG_member, name: "first",
+// CHECK-SAME: size: 64)
+// CHECK: !DIDerivedType(tag: DW_TAG_member, name: "second", 
+// CHECK-SAME: size: 128, offset: 64)