[PATCH] LLDB formatter for llvm::Optional

[Justin Bogner]

I'm not all that familiar with lldb formatters, so please point out if
this is done strangely.

This teaches lldb how to print Optional, so instead of

    (llvm::Optional<int>) $1 = {
      storage = {
        llvm::AlignedCharArray<4, 4> = (buffer = "\x00\x00")
      }
      hasVal = true
    }

we get

    (llvm::Optional<int>) $1 = 0

or if the optional doesn't have a value, then

    (llvm::Optional<int>) $1 = None

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