<rdar://problem/12975489>

1. Using mach port number, just like when inferior is paused.
2. Use key:value pair of thread used time instead of comma separated notation.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@172012 91177308-0d34-0410-b5e6-96231b3b80d8