[llvm] [llvm-objdump] Print out xcoff load of xcoff object file with option private-headers (PR #121226)

[zhijian lin via llvm-commits]

diggerlin wrote:

the test contest of llvm/test/tools/llvm-objdump/XCOFF/private-headers-option.test
come from https://github.com/llvm/llvm-project/blob/main/llvm/test/tools/llvm-readobj/XCOFF/loader-section-header.test

https://github.com/llvm/llvm-project/pull/121226