improve wording in a diagnostic to make it clear that we never intend to support the vla-in-structure extension that GCC does.  PR3562 Also wrap some long lines.
improve wording in a diagnostic to make it clear that we never intend to support
the vla-in-structure extension that GCC does.  PR3562
Also wrap some long lines.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@64493 91177308-0d34-0410-b5e6-96231b3b80d8

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