Update platform section to mention Linux/FreeBSD local debugging support, and also mention that LLDB builds on Linux with clang and libstdc++/libc++.
Update platform section to mention Linux/FreeBSD local debugging support, and also mention that LLDB builds on Linux with clang and libstdc++/libc++.



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@167768 91177308-0d34-0410-b5e6-96231b3b80d8

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