Server fails to build with clang-3.4 due to new warnings triggered by v8 code

In file included from src/third_party/v8/src/x64/builtins-x64.cc:28:

In file included from src/third_party/v8/src/v8.h:56:

In file included from src/third_party/v8/src/v8utils.h:31:

src/third_party/v8/src/utils.h:976:20: error: comparison of constant 32 with expression of type 'v8::internal::AstPropertiesFlag' is always true [-Werror,-Wtautological-constant-out-of-range-compare]

    ASSERT(element < static_cast<int>(sizeof(T) * CHAR_BIT));