* lib/trace-support.exp (get_in_proc_agent): New.
* gdb.trace/change-loc.exp: Call get_in_proc_agent to get the location
of in process trace agent.
* gdb.trace/ftrace.exp: Likewise.
* gdb.trace/pending.exp: Likewise.
* gdb.trace/trace-break.exp: Likewise.
* gdb.trace/trace-mt.exp
* gdb.trace/tspeed.exp: Likewise.
* gdb.trace/tstatus.exp
* gdb.trace/strace.exp: Likewise.