__underlying_type feature.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@135402
91177308-0d34-0410-b5e6-
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<li><code>__is_polymorphic</code> (GNU, Microsoft)</li>
<li><code>__is_union</code> (GNU, Microsoft)</li>
<li><code>__is_literal(type)</code>: Determines whether the given type is a literal type</li>
+ <li><code>__underlying_type(type)</code>: Retrieves the underlying type for a given <code>enum</code> type. This trait is required to implement the C++0x standard library.</li>
</ul>
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