[test] Adding specific tests for the warning for protocol inheritance class keyword syntax deprecation

Author: LucianoPAlmeida

test/decl/inherit/inherit_anyobject_protocol.swift

@@ -0,0 +1,7 @@
+// RUN: %target-typecheck-verify-swift 
+
+protocol P: class {}
+protocol P1: AnyObject {}
+protocol P2 {}
+protocol P3: class, P2 {} 
+protocol P4: P2, class {} // expected-error {{'class' must come first in the requirement list}}

test/decl/inherit/inherit_anyobject_protocol_swift5.swift

@@ -0,0 +1,10 @@
+// RUN: %target-typecheck-verify-swift -swift-version 5
+
+protocol P: class {}
+// expected-warning@-1 {{using 'class' keyword for protocol inheritance is deprecated; use 'AnyObject' instead}} {{13-18=AnyObject}} 
+protocol P1: AnyObject {}
+protocol P2 {}
+protocol P3: class, P2 {} 
+// expected-warning@-1 {{using 'class' keyword for protocol inheritance is deprecated; use 'AnyObject' instead}} {{14-19=AnyObject}}
+protocol P4: P2, class {} // expected-error {{'class' must come first in the requirement list}}
+// expected-warning@-1 {{using 'class' keyword for protocol inheritance is deprecated; use 'AnyObject' instead}} {{18-23=AnyObject}}