[dwarfdump] Fix printing of .debug_line offset.

Fixes 32-bit buildbots:
  http://bb.pgr.jp/builders/test-llvm-i686-linux-RA/builds/542
  http://lab.llvm.org:8011/builders/clang-cmake-thumbv7-a15/builds/11533
  http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/11494

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314291 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed