Disable clang's -Wnested-anon-types to remove piles of warnings from a Clang -pedantic selfhost

[Richard Smith]

Hi,

The attached patch adds -Wno-nested-anon-types to -pedantic builds of
LLVM. This warning catches uses of an extremely minor C++ extension,
which is supported by basically every existing C++ compiler (although
EDG also diagnoses it, and rejects it in its strict mode). The code
pattern looks like:

struct X {
  union {
    struct {
      int a;
      int b;
    } S;
  };
};

This is ill-formed, because it is not valid to define types within an
anonymous union.

Thanks!
Richard
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