[llvm-objdump] - Dump the archive headers when -all-headers is specified.

When -all-headers is given it is supposed to dump all headers,
but now it skips the archive headers for no reason.

The patch fixes that.

Differential revision: https://reviews.llvm.org/D56780

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351547 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed