Mark the newly added '__libcpp_is_constant_evaluated' as 'inline', since it can be included multiple times by multiple headers, and we don't want 'duplicate definition' errors.

llvm-svn: 364879

Author: mclow

libcxx/include/type_traits

@@ -4007,9 +4007,11 @@ inline constexpr bool is_constant_evaluated() noexcept {
 }
 #endif
 
-_LIBCPP_CONSTEXPR bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); }
+inline _LIBCPP_CONSTEXPR
+bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); }
 #else
-_LIBCPP_CONSTEXPR bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; }
+inline _LIBCPP_CONSTEXPR
+bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; }
 #endif
 
 template <class _CharT>