[libcxx] [test] Rename _Tp to T. NFCI.

This improves readability and (theoretically) improves portability,
as _Ugly names are reserved.

llvm-svn: 310758
diff --git a/libcxx/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp b/libcxx/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
index db7168c..0b97960 100644
--- a/libcxx/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
@@ -11,7 +11,7 @@
 #include <functional>
 #include <string>
 
-template <class _Tp>
+template <class T>
 struct is_transparent
 {
 private:
@@ -19,7 +19,7 @@
     template <class _Up> static __two __test(...);
     template <class _Up> static char __test(typename _Up::is_transparent* = 0);
 public:
-    static const bool value = sizeof(__test<_Tp>(0)) == 1;
+    static const bool value = sizeof(__test<T>(0)) == 1;
 };