Adding support for process attach by pid on Linux.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181374 91177308-0d34-0410-b5e6-96231b3b80d8
Add code to ReplaceDSYMSectionsWithExecutableSections() to handle the case where
a new section is added to the executable after the dSYM has been created, e.g.
the CTF segment added to mach_kernel after all other linking and processing has
been finished.
<rdar://problem/13258780> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181375 91177308-0d34-0410-b5e6-96231b3b80d8