[PATCH] Mangling of member-expressions involving anonymous unions.

[Tomasz Miąsko]

Indeed, something like "if (!member) return mangleExpression(base)", would be
really nice, but the problem is that we need a member name from outermost
MemberExpr generated from IndirectFieldDecl, and isArrow from innermost
MemberExpr generated from IndirectFieldDecl.

I updated the code to skip over all bases whose types are anonymous structs or
unions, though I will mention that first version that relied on empty
identifiers would also work.

http://reviews.llvm.org/D5997

Files:
  lib/AST/ItaniumMangle.cpp
  test/CodeGenCXX/mangle-exprs.cpp
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