[llvm] [llvm-objdump] Remove some unneeded headers. (PR #120541)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

LGTM. Do you need me to merge this?

I note that you have a private GitHub email setting applied at the moment. Please note the following from the LLVM Developer Policy:

> The LLVM project uses email to communicate to contributors outside of the GitHub platform about their past contributions. Primarily, our buildbot infrastructure uses emails to contact contributors about build and test failures. Therefore, the LLVM community requires contributors to have a public email address associated with their GitHub commits, so please ensure that “Keep my email addresses private” is disabled in your [account settings](https://github.com/settings/emails).

If you'd like me to merge this for you, please modify your GitHub settings according to the policy and let me know you have done so. Then I can merge it for you.

https://github.com/llvm/llvm-project/pull/120541