PathMappingList doesn't need a virtual destructor.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@185207 91177308-0d34-0410-b5e6-96231b3b80d8
ArchSpec doesn't need a virtual destructor.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@185208 91177308-0d34-0410-b5e6-96231b3b80d8
FileSpec destructor doesn't need to be virtual.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@185210 91177308-0d34-0410-b5e6-96231b3b80d8