[patch] Differentiate dbg msg on IPA and gdbserver

[Yao Qi]

Hi,
I find debug message printed from IPA and gdbserver are both prefixed
with "gdbserver/tracepoint".  It is unclear.  This patch is to give
different prefix of debug message for IPA and gdbserver.

With this patch applied, this debug log becomes,

 gdbserver/tracepoint: signalling helper thread
 gdbserver/tracepoint: waiting for helper thread's response
-gdbserver/tracepoint: Returning static tracepoint
+ipa: Returning static tracepoint
 gdbserver/tracepoint: helper thread's response received

It becomes clear to see the interaction between gdbserver and IPA.  OK
form mainline?

-- 
Yao (齐尧)
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