Make bit_cast fail if the source or dest are not trivially copyable

base/bit_cast.h

Index: base/bit_cast.h
diff --git a/base/bit_cast.h b/base/bit_cast.h
index c9514bceef4d861f660aa200eaccc997c6588361..04c1957f6aca0b1d2e453cfe2e619274398b15ca 100644
--- a/base/bit_cast.h
+++ b/base/bit_cast.h
@@ -63,6 +63,10 @@ template <class Dest, class Source>
 inline Dest bit_cast(const Source& source) {
   static_assert(sizeof(Dest) == sizeof(Source),
                 "bit_cast requires source and destination to be the same size");
+  static_assert(std::is_trivially_copyable<Dest>::value,
+                "bit_cast requires the destination type to be copyable");
+  static_assert(std::is_trivially_copyable<Source>::value,
+                "bit_cast requires the source type to be copyable");
 
 #if (__GNUC__ > 5 || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1) || \
      (defined(__clang__) && defined(_LIBCPP_VERSION)))