Remove unused friend class forward definitions (causing problem with MSVC anyway).

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@191114 91177308-0d34-0410-b5e6-96231b3b80d8
Add backslash as path separator for Win32.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@191115 91177308-0d34-0410-b5e6-96231b3b80d8
Various small changes for build of LLDB on Visual Studio 2013 RC (MSVC12)

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@191116 91177308-0d34-0410-b5e6-96231b3b80d8