[PATCH] Mangling of anonymous unions

[Evgeny Astigeevich]

Cleaned up code:
- no need of 'if' checks as VarDecl without an identifier should be an anonymous union declaration.
- created function 'findAnonymousUnionVarDeclName'

http://reviews.llvm.org/D6295

Files:
  include/clang/AST/Decl.h
  lib/AST/Decl.cpp
  lib/AST/ItaniumCXXABI.cpp
  lib/AST/ItaniumMangle.cpp
  test/CodeGenCXX/mangle-local-anonymous-unions.cpp
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