[llvm] [llvm-objdump] Implement decoding auxiliary header for xcoff with llvm-objdump --private-headers (PR #105682)

[zhijian lin via llvm-commits]

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+## Test that `the llvm-objdump --private-headers` print out the auxiliary header of XCOFF object file.
+
+# RUN: yaml2obj %s -o %t1
+# RUN: llvm-objdump --private-headers %t1 | \
+# RUN:   FileCheck %s --check-prefix=CHECK32 --match-full-lines --strict-whitespace
+# RUN: cp %t1 %t1_err1
+# RUN: python -c "with open(r'%t1_err1', 'r+b') as input: input.seek(17); input.write(b'\x45')"
+# RUN: python -c "with open(r'%t1_err1', 'r+b') as input: input.seek(4); input.write(b'\x00')"
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diggerlin wrote:

> you may also wish to look at using split-file, to allow you to have a proper python script, rather than these inline snippets.
This a one/two lines python, I do not think it need a split-file.



https://github.com/llvm/llvm-project/pull/105682