Fix whitespace

Author: DougGregor

include/swift/AST/DiagnosticsSema.def

@@ -1688,7 +1688,7 @@ ERROR(requires_not_suitable_archetype,none,
       (TypeLoc))
 WARNING(requires_no_same_type_archetype,none,
         "neither type in same-type constraint (%0 or %1) refers to a "
-        "generic parameter  or associated type",
+        "generic parameter or associated type",
         (Type, Type))
 
 ERROR(requires_generic_params_made_equal,none,

test/Generics/same_type_constraints.swift

@@ -376,5 +376,5 @@ func resultTypeSuppress<T: P1>() -> StructTakingP1<T> {
 typealias NotAnInt = Double
 
 extension X11 where NotAnInt == Int { }
-// expected-warning@-1{{neither type in same-type constraint ('NotAnInt' (aka 'Double') or 'Int') refers to a generic parameter  or associated type}}
+// expected-warning@-1{{neither type in same-type constraint ('NotAnInt' (aka 'Double') or 'Int') refers to a generic parameter or associated type}}
 // expected-error@-2{{generic signature requires types 'NotAnInt' (aka 'Double') and 'Int' to be the same}}

test/decl/typealias/protocol.swift

@@ -268,7 +268,7 @@ extension P10 {
   typealias U = Float
 }
 
-extension P10 where T == Int { } // expected-warning{{neither type in same-type constraint ('P10.T' (aka 'Int') or 'Int') refers to a generic parameter  or associated type}}
+extension P10 where T == Int { } // expected-warning{{neither type in same-type constraint ('P10.T' (aka 'Int') or 'Int') refers to a generic parameter or associated type}}
 
 extension P10 where A == X<T> { }
 
@@ -277,4 +277,4 @@ extension P10 where A == X<U> { } // expected-error{{use of undeclared type 'U'}
 extension P10 where A == X<Self.U> { }
 
 extension P10 where V == Int { } // expected-warning 3{{'V' is deprecated: just use Int, silly}}
-// expected-warning@-1{{neither type in same-type constraint ('P10.V' (aka 'Int') or 'Int') refers to a generic parameter  or associated type}}
+// expected-warning@-1{{neither type in same-type constraint ('P10.V' (aka 'Int') or 'Int') refers to a generic parameter or associated type}}