Fix LLDB-MI -data-read-memory-bytes command to comply with GDB/MI spec

Summary:
- The address argument can now be an expression (e.g. &array), it's no longer restricted to being just a number literal.
- The -o (offset) option is now properly handled, not just silently ignored.
- The --thread option is now properly handled.
- A new --frame option has been added for consistency with GDB.
- Added a new test to verify old and new functionality.

Patch by Vadim Macagon. Thanks!

Test Plan: ./dotest.py -A x86_64 -C clang --executable $BUILDDIR/bin/lldb tools/lldb-mi/data

Reviewers: domipheus, abidh, ki.stfu

Reviewed By: abidh, ki.stfu

Subscribers: brucem, lldb-commits

Differential Revision: http://reviews.llvm.org/D9470

llvm-svn: 236694