Support: use std::is_trivially_copyable on MSVC

MSVC 2015 and newer have std::is_trivially_copyable available for use.
We should prefer that over the std::is_class to get this check be
correct.

llvm-svn: 348042

Author: compnerd

llvm/include/llvm/Support/type_traits.h

@@ -30,9 +30,10 @@ namespace llvm {
 template <typename T>
 struct isPodLike {
   // std::is_trivially_copyable is available in libc++ with clang, libstdc++
-  // that comes with GCC 5.
+  // that comes with GCC 5.  MSVC 2015 and newer also have
+  // std::is_trivially_copyable.
 #if (__has_feature(is_trivially_copyable) && defined(_LIBCPP_VERSION)) ||      \
-    (defined(__GNUC__) && __GNUC__ >= 5)
+    (defined(__GNUC__) && __GNUC__ >= 5) || defined(_MSC_VER)
   // If the compiler supports the is_trivially_copyable trait use it, as it
   // matches the definition of isPodLike closely.
   static const bool value = std::is_trivially_copyable<T>::value;