[llvm-readobj] Downgrade 'PT_DYNAMIC segment offset + size exceeds the size of...

[llvm-readobj] Downgrade 'PT_DYNAMIC segment offset + size exceeds the size of the file' from an error to a warning

Summary: This allows llvm-readobj to print other useful information for truncated files instead of giving up.

Reviewers: jhenderson, grimar, MaskRay

Reviewed By: jhenderson, grimar, MaskRay

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66036

llvm-svn: 368576