Clang's ASTImport now returns Expected<> Types
Clang's ASTImport now returns Expected<> Types

Clang changed Import to return an Expected<QualType> so updated the
usage to match

Clang was changed here:
git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@360760
91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb