[analyzer][PlistMacroExpansion] Part 2.: Retrieving the macro name and primitive expansion
[analyzer][PlistMacroExpansion] Part 2.: Retrieving the macro name and primitive expansion

This patch adds a couple new functions to acquire the macro's name, and also
expands it, although it doesn't expand the arguments, as seen from the test files

Differential Revision: https://reviews.llvm.org/D52794

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@346095 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang