Cleaned up and removed unused code.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175105 91177308-0d34-0410-b5e6-96231b3b80d8
A lot more cleanup on the AppleObjCRuntimeV2 class.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175106 91177308-0d34-0410-b5e6-96231b3b80d8
Centralized the expression prefixes that are used for both expressions and utility functions.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175108 91177308-0d34-0410-b5e6-96231b3b80d8