Added support to the expression parser for finding
Objective-C types and enums in modules.  We now have
a three-stage fallback when looking for methods and
properties: first the DWARF, second the modules, third
the runtime.

<rdar://problem/18782288>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@223939 91177308-0d34-0410-b5e6-96231b3b80d8