[libcxx] [test] Strip trailing whitespace.

Fixes D27786.

llvm-svn: 290922

libcxx/test/std/experimental/utilities/meta/meta.detect/detected_or.pass.cpp

@@ -19,7 +19,7 @@ namespace ex = std::experimental;
 
 template <typename T>
   using hasFoo = typename T::Foo;
-  
+
 struct yesFoo {
     using Foo = int;
 };

libcxx/test/std/experimental/utilities/meta/meta.detect/detected_t.pass.cpp

@@ -19,7 +19,7 @@ namespace ex = std::experimental;
 
 template <typename T>
   using callFoo = decltype(std::declval<T&>().Foo());
-  
+
 struct yesFoo {
     int Foo() { return 0; }
 };

libcxx/test/std/experimental/utilities/meta/meta.detect/is_detected.pass.cpp

@@ -19,7 +19,7 @@ namespace ex = std::experimental;
 
 template <typename T>
   using copy_assign_t = decltype(std::declval<T&>() = std::declval<T const &>());
-  
+
 struct not_assignable {
     not_assignable & operator=(const not_assignable&) = delete;
 };

libcxx/test/std/experimental/utilities/meta/meta.detect/is_detected_convertible.pass.cpp

@@ -19,7 +19,7 @@ namespace ex = std::experimental;
 
 template <typename T>
   using callFoo = decltype(std::declval<T&>().Foo());
-  
+
 struct yesFoo {
     int Foo() { return 0; }
 };

libcxx/test/std/experimental/utilities/meta/meta.detect/is_detected_exact.pass.cpp

@@ -19,7 +19,7 @@ namespace ex = std::experimental;
 
 template <typename T>
   using callFoo = decltype(std::declval<T&>().Foo());
-  
+
 struct yesFoo {
     int Foo() { return 0; }
 };