perf trace: Beautify 'gettid' syscall result

perf trace: Beautify 'gettid' syscall result

Before:

  # trace -a -e gettid sleep 0.01
<SNIP>
     4.863 ( 0.005 ms): Chrome_ChildIO/26241 gettid() = 26241
     4.931 ( 0.004 ms): Chrome_IOThrea/26154 gettid() = 26154
     4.942 ( 0.001 ms): Chrome_IOThrea/26154 gettid() = 26154
     4.946 ( 0.001 ms): Chrome_IOThrea/26154 gettid() = 26154
     4.970 ( 0.002 ms): Chrome_IOThrea/26154 gettid() = 26154
  #

After:

  # trace -a -e gettid sleep 0.01
     0.000 ( 0.009 ms): Chrome_IOThrea/26154 gettid() = 26154 (Chrome_IOThread)
<SNIP>
     3.416 ( 0.002 ms): Chrome_ChildIO/26241 gettid() = 26241 (Chrome_ChildIOT)
     3.424 ( 0.001 ms): Chrome_ChildIO/26241 gettid() = 26241 (Chrome_ChildIOT)
     3.343 ( 0.002 ms): chrome/26116 gettid() = 26116 (chrome)
     3.386 ( 0.002 ms): Chrome_IOThrea/26154 gettid() = 26154 (Chrome_IOThread)
     4.003 ( 0.003 ms): Chrome_ChildIO/26241 gettid() = 26241 (Chrome_ChildIOT)
     4.031 ( 0.002 ms): Chrome_IOThrea/26154 gettid() = 26154 (Chrome_IOThread)
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-kyg4gz2yy0vkrrh2vtq29u71@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>