Fix __fp16 types so we can display them and use them in expressions.
Fix __fp16 types so we can display them and use them in expressions.

I am not adding a test case for this since I don't know how portable the __fp16 type is between compilers and I don't want to break the test suite.

<rdar://problem/22375079>



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@252012 91177308-0d34-0410-b5e6-96231b3b80d8

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