Refactoring for struct UserArea:
- Decouples RegisterContext_x86_64 from UserArea.
- Restores the original definition of UserArea so that it can be used to generate offsets for use with ptrace.
- Moves UserArea to the 64-bit Linux specialization.

- Also fixes an off-by-one error for the size of m_gpr.
- Also adds a TODO comment noting the need for a mechanism to identify the correct plugin based on the target OS (and architecture).

Reviewed by: Matt Kopec and Samuel Jacob


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181055 91177308-0d34-0410-b5e6-96231b3b80d8