Use llvm::TempDIScope instead of manually deleting a temporary MDNode.
Use llvm::TempDIScope instead of manually deleting a temporary MDNode.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@260113 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit edfe68550c670419cdbb537f5a262e28764377a8)

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