perf tests: Fix dwarf unwind for stripped binaries

perf tests: Fix dwarf unwind for stripped binaries

When we strip the perf binary, dwarf unwind test stop
to work. The reason is that strip will remove static
function symbols, which we need to check for unwind.

This change will keep this test working in cases where
the global symbols are put into dynamic symbol table,
which is the case on x86. It still won't work on powerpc.

Making those 5 local functions global, and adding
'test_dwarf_unwind__' to their names.

Committer testing:

Before:

  # perf test dwarf
  58: DWARF unwind                               : Ok
  # strip ~/bin/perf
  # perf test dwarf
  58: DWARF unwind                               : FAILED!
  # perf test -v dwarf
  58: DWARF unwind                               :
  --- start ---
  test child forked, pid 6590
  unwind: thread map already set, dso=/home/acme/bin/perf
  <SNIP>
  unwind: access_mem addr 0x7ffce6c48098 val 48563f, offset 1144
  unwind: test__dwarf_unwind:ip = 0x4a54e5 (0xa54e5)
  got: test__dwarf_unwind 0xa54e5, expecting test__dwarf_unwind
  unwind: '':ip = 0x4a50bb (0xa50bb)
  failed: got unresolved address 0xa50bb
  unwind failed
  test child finished with -1
  ---- end ----
  DWARF unwind: FAILED!
  #

After:

  # perf test dwarf
  58: DWARF unwind                               : Ok
  # strip ~/bin/perf
  # perf test dwarf
  58: DWARF unwind                               : Ok
  #
  # perf test -v dwarf
  58: DWARF unwind                               :
  --- start ---
  test child forked, pid 7219
  unwind: thread map already set, dso=/home/acme/bin/perf
  <SNIP>
  unwind: access_mem addr 0x7fff007da2c8 val 48575f, offset 1144
  unwind: test__arch_unwind_sample:ip = 0x589044 (0x189044)
  got: test__arch_unwind_sample 0x189044, expecting test__arch_unwind_sample
  unwind: test_dwarf_unwind__thread:ip = 0x4a52f7 (0xa52f7)
  got: test_dwarf_unwind__thread 0xa52f7, expecting test_dwarf_unwind__thread
  unwind: test_dwarf_unwind__compare:ip = 0x4a5468 (0xa5468)
  got: test_dwarf_unwind__compare 0xa5468, expecting test_dwarf_unwind__compare
  unwind: bsearch:ip = 0x7f6608ae94d8 (0x394d8)
  got: bsearch 0x394d8, expecting bsearch
  unwind: test_dwarf_unwind__krava_3:ip = 0x4a54d1 (0xa54d1)
  got: test_dwarf_unwind__krava_3 0xa54d1, expecting test_dwarf_unwind__krava_3
  unwind: test_dwarf_unwind__krava_2:ip = 0x4a550b (0xa550b)
  got: test_dwarf_unwind__krava_2 0xa550b, expecting test_dwarf_unwind__krava_2
  unwind: test_dwarf_unwind__krava_1:ip = 0x4a554b (0xa554b)
  got: test_dwarf_unwind__krava_1 0xa554b, expecting test_dwarf_unwind__krava_1
  unwind: test__dwarf_unwind:ip = 0x4a5605 (0xa5605)
  got: test__dwarf_unwind 0xa5605, expecting test__dwarf_unwind
  test child finished with 0
  ---- end ----
  DWARF unwind: Ok
  #

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180206181813.10943-17-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>