[analyzer][PlistMacroExpansion] Part 4.: Support for __VA_ARGS__
[analyzer][PlistMacroExpansion] Part 4.: Support for __VA_ARGS__

Differential Revision: https://reviews.llvm.org/D52986

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@347888 91177308-0d34-0410-b5e6-96231b3b80d8

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