Add warning for c++ member variable shadowing

[James Sun via cfe-commits]

Dear members

Here is a patch (attached) to create warnings where a member variable shadows the one in one of its inheriting classes. For cases where we really don't want to shadow member variables, e.g.

class a {
  int foo;
}

class b : a {
  int foo; // Generate a warning
}

This patch
(1) adds a member variable shadowing checking, and
(2) incorporates it to the unit tests.


Comments are welcome.

Thanks

James
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