[llvm-readobj] - Teach readobj to print PT_OPENBSD_BOOTDATA header

These are OpenBSD specific program headers.

OpenBSD commit:
https://github.com/openbsd/src/commit/d39116912b9536bd77326260dc5c6e593fd4ee24

It is required for fixing PR31288.

Differential revision: https://reviews.llvm.org/D27456

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288831 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed