Small cleanups for the new enum fixes:
- Fix Xcode project to have source files for SBTypeEnumMember.h/SBTypeEnumMember.cpp in the right place
- Rename a member variable to inluce "_sp" suffix since it is a shared pointer
- Cleanup initialization code for TypeEnumMemberImpl to not warn about out of order initialization



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@210051 91177308-0d34-0410-b5e6-96231b3b80d8