perf probe: Warn user to rebuild target with debuginfo

perf probe: Warn user to rebuild target with debuginfo

Warn user to rebuild target with debuginfo when the perf probe fails to
find debug information in the target binary.

Without this, perf probe just reports the failure, but it's no hint for
users. This gives more hint for users.

Without this:

  $ strip perf
  $ ./perf probe -x perf -L argv_split
  Failed to open debuginfo file.
    Error: Failed to show lines.

With this:

  $ strip perf
  $ ./perf probe -x perf -L argv_split
  The /home/fedora/ksrc/linux-3/tools/perf/perf file has no debug information.
  Rebuild with -g, or install an appropriate debuginfo package.
    Error: Failed to show lines.

The "rebuild with ..." part changes to "rebuild with CONFIG_DEBUG_INFO"
if the target is the kernel or a kernel module.

Suggested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20140815014432.29869.57941.stgit@kbuild-fedora.novalocal
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>