RegisterValues can now report their contents as
UInts even if their contents were set as bytes.
This makes expressions using registers work
better, especially with core files.

<rdar://problem/13743427>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@180810 91177308-0d34-0410-b5e6-96231b3b80d8