Fix error tests

Author: johnno1962

test/Parse/raw_string_errors.swift

@@ -1,11 +1,14 @@
 // RUN: %target-typecheck-verify-swift
 
 #"\##("invalid")"#
-// expected-error@-1{{Too many # characters in delimited escape}}
+// expected-error@-1{{too many '#' characters in delimited escape}}
+// expected-error@-2{{invalid escape sequence in literal}}
 
 ####"invalid"###
 // expected-error@-1{{unterminated string literal}}
 
 ###"invalid"####
-// expected-error@-1{{consecutive statements on a line must be separated by ';'}}
-// expected-error@-2{{expected expression}}
+// expected-error@-1{{too many '#' characters in closing delimiter}}
+// expected-error@-2{{consecutive statements on a line must be separated by ';'}}
+// expected-error@-3{{expected expression}}
+// expected-warning@-4{{string literal is unused}}