[llvm-objdump] Move --start-address >= --stop-address check out of the

[llvm-objdump] Move --start-address >= --stop-address check out of the
-d code.

Summary:
Move it into `main` function so the checking is effective for all actions
user may do with llvm-objdump; notably, -r and -s in addition to existing -d.

Match GNU behavior.

Reviewers: jhenderson, grimar, MaskRay, rupprecht

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63631

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364118 91177308-0d34-0410-b5e6-96231b3b80d8