[llvm] [llvm-objdump] Print out xcoff file header for xcoff object file with option private-headers (PR #96350)

[James Henderson via llvm-commits]

================
@@ -1,11 +1,15 @@
 ## Test the --private-headers option for XCOFF object files.
----------------
jh7370 wrote:

You can drop "-option" from the test name, i.e. just call this file `private-headers.test`.

https://github.com/llvm/llvm-project/pull/96350