Pack module before making symbolic version

  We need PT_LOAD segments to match for the gdb sake.
  If we pack module after stripping symbolic version
  PT_LOAD differ from actual ones; this confuses gdb.

Bug: http://b/20687795
Change-Id: If7b1ffcda918d0cc47051a30ca1202007ed62403
(cherry picked from commit 258b29cf)