Update .clang-format file to support break after return type.
Update .clang-format file to support break after return type.

This depends on having a recently built version of clang-format
installed, as the patch to support this behavior was only just
recently added to clang-format.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@256526 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb