[PATCH] Add specific warning flags for GNU ext in Sema

[Peter Lewis]

This patch adds the following specific warning flags to -Wgnu:

gnu-anonymous-struct
gnu-compound-literal-initializer
gnu-empty-struct
gnu-flexible-array-initializer
gnu-flexible-array-union-member
gnu-folding-constant
redeclared-class-member
gnu-redeclared-enum
gnu-union-cast
gnu-variable-sized-type-not-at-end

At Eli's suggestion, redeclared-class-member does not have the gnu prefix, and this patch subsumes ext_vla_folded_to_constant into gnu-folding-constant (a visible effect of this is that -Wgnu enables gnu-folding-constant which enabled ext_vla_folded_to_constant where previously it would not have).

http://llvm-reviews.chandlerc.com/D1605

Files:
  test/Sema/gnu-flags.c
  test/Misc/warning-flags-tree.c
  test/Misc/warning-flags.c
  test/SemaCXX/gnu-flags.cpp
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
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