[llvm-objdump] Add warning if --disassemble-functions specifies an unknown symbol
Summary:
Fixes Bug 41904 https://bugs.llvm.org/show_bug.cgi?id=41904
Re-land r362768 after it was reverted in r362826.
Reviewers: jhenderson, rupprecht, grimar, MaskRay
Reviewed By: jhenderson, rupprecht, MaskRay
Subscribers: dexonsmith, rupprecht, kristina, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62275
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362838
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