[tests] Adjust tests in validation suit

Author: LucianoPAlmeida

validation-test/stdlib/AssertDiagnosticsSIL.swift

@@ -3,5 +3,5 @@
 func assertionFailure_isNotNoreturn() -> Int {
   _ = 0 // Don't implicitly return the assertionFailure call.
   assertionFailure("")
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 

validation-test/stdlib/BoolDiagnostics_Dataflow.swift

@@ -8,49 +8,49 @@ func test_constantFoldAnd1() -> Int {
     return 42
   }
   // FIXME: this is a false positive.
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldAnd2() -> Int {
   while true && false {
     return 42
   }
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldAnd3() -> Int {
   while false && true {
     return 42
   }
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldAnd4() -> Int {
   while false && false {
     return 42
   }
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldOr1() -> Int {
   while true || true {
     return 42
   }
   // FIXME: this is a false positive.
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldOr2() -> Int {
   while true || false {
     return 42
   }
   // FIXME: this is a false positive.
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldOr3() -> Int {
   while false || true {
     return 42
   }
   // FIXME: this is a false positive.
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}
 
 func test_constantFoldOr4() -> Int {
   while false || false {
     return 42
   }
-} // expected-error {{missing return in function expected to return 'Int'}}
+} // expected-error {{missing return in global function expected to return 'Int'}}