Add a getName accessor for ModuleMacros.
Add a getName accessor for ModuleMacros.

Swift would like to be able to access the name of a ModuleMacro.
There was some discussion of this in
https://github.com/apple/swift-clang/pull/93, suggesting that it makes
sense to have this accessor in Clang.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@310622 91177308-0d34-0410-b5e6-96231b3b80d8

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