[cfe-commits] Patch: allow RecursiveASTVisitor to visit implicit ctor initializers (for which isWritten() returns false)

[James Dennett]

Now that we have RecursiveASTVisitor::shouldVisitImplicitCode(), it
would be good to allow RAV to visit CXXCtorInitializer objects for
which isWritten() returns false (i.e., the initializers that are
implicitly added -- in C++98 that can happen because the user didn't
mention a direct subobject that has a constructor, I'm not sure if it
can also happen in C++11 when NSDMIs are used).

The change to do this is a one-liner in
RecursiveASTVisitor<T>::TraverseConstructorInitializer.  This is the
only use of isWritten() in RAV.

The attached patch includes a test for the new functionality.

Comments on either style or substance would be appreciated.

-- James
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