[llvm-readobj] Consistent use of ScopedPrinter

There were a few places where outs() was being used
directly rather than the ScopedPrinter object.

Differential Revision: https://reviews.llvm.org/D41370

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@322141 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed