Replace "#if __clang__" by "#if __has_feature(attribute_analyzer_noreturn)" to be consistent with all other snippets on this page.
Replace "#if __clang__" by "#if __has_feature(attribute_analyzer_noreturn)" to be consistent with all other snippets on this page.

Patch by Jean-Daniel Dupas!

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@118603 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang