[CFG] NFC: Speculative attempt to fix MSVC internal compiler error on buildbot.
[CFG] NFC: Speculative attempt to fix MSVC internal compiler error on buildbot.

Don't use fancy initialization and member access in a DenseMap.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@325969 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