the log entry for SBThread::GetProcess() would not include the pointer to the process because we were using the value of the (otherwise unused) process_sp - instead of fetching the SP from sb_process

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176231 91177308-0d34-0410-b5e6-96231b3b80d8