Fixing coercion error tests

Author: LucianoPAlmeida

test/ClangImporter/objc_parse.swift

@@ -550,8 +550,8 @@ func testProtocolQualified(_ obj: CopyableNSObject, cell: CopyableSomeCell,
   _ = cell as NSCopying
   _ = cell as SomeCell
 
-  _ = plainObj as CopyableNSObject // expected-error {{'NSObject' is not convertible to 'CopyableNSObject' (aka 'NSCopying & NSObjectProtocol'); did you mean to use 'as!' to force downcast?}} {{16-18=as!}}
-  _ = plainCell as CopyableSomeCell // expected-error {{'SomeCell' is not convertible to 'CopyableSomeCell' (aka 'SomeCell & NSCopying'); did you mean to use 'as!' to force downcast?}}
+  _ = plainObj as CopyableNSObject // expected-error {{value of type 'NSObject' does not conform to 'NSCopying' in coercion}}
+  _ = plainCell as CopyableSomeCell // expected-error {{value of type 'SomeCell' does not conform to 'NSCopying' in coercion}}
 }
 
 extension Printing {

test/Generics/function_defs.swift

@@ -53,7 +53,7 @@ func otherExistential<T : EqualComparable>(_ t1: T) {
   otherEqComp2 = t1 // expected-error{{value of type 'T' does not conform to 'OtherEqualComparable' in assignment}}
   _ = otherEqComp2
 
-  _ = t1 as EqualComparable & OtherEqualComparable // expected-error{{'T' is not convertible to 'EqualComparable & OtherEqualComparable'; did you mean to use 'as!' to force downcast?}} {{10-12=as!}} expected-error{{protocol 'OtherEqualComparable' can only be used as a generic constraint}} expected-error{{protocol 'EqualComparable' can only be used as a generic constraint}}
+  _ = t1 as EqualComparable & OtherEqualComparable // expected-error{{value of type 'T' does not conform to 'OtherEqualComparable' in coercion}} expected-error{{protocol 'OtherEqualComparable' can only be used as a generic constraint}} expected-error{{protocol 'EqualComparable' can only be used as a generic constraint}}
 }
 
 protocol Runcible {

test/decl/protocol/protocols.swift

@@ -118,7 +118,7 @@ struct Circle {
 func testCircular(_ circle: Circle) {
   // FIXME: It would be nice if this failure were suppressed because the protocols
   // have circular definitions.
-  _ = circle as CircleStart // expected-error{{'Circle' is not convertible to 'CircleStart'; did you mean to use 'as!' to force downcast?}} {{14-16=as!}}
+  _ = circle as CircleStart // expected-error{{value of type 'Circle' does not conform to 'CircleStart' in coercion}}
 }
 
 // <rdar://problem/14750346>
@@ -482,7 +482,7 @@ func f<T : C1>(_ x : T) {
 
 class C2 {}
 func g<T : C2>(_ x : T) {
-  x as P2 // expected-error{{'T' is not convertible to 'P2'; did you mean to use 'as!' to force downcast?}} {{5-7=as!}}
+  x as P2 // expected-error {{value of type 'T' does not conform to 'P2' in coercion}}
 }
 
 class C3 : P1 {} // expected-error{{type 'C3' does not conform to protocol 'P1'}}