<rdar://problem/12928282>

Added SBTarget::EvaluateExpression() so expressions can be evaluated without needing a process.

Also fixed many functions that deal with clang AST types to be able to properly handle the clang::Type::Elaborated types ("struct foo", "class bar").



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@171476 91177308-0d34-0410-b5e6-96231b3b80d8