[llvm] [llvm-readobj, ELF] Support reading binary with more than PN_XNUM segments. (PR #165278)

[via llvm-commits]

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+## Show that llvm-readelf can handle an input file with many segments.
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-readobj --file-headers --sections --segments %t | FileCheck %s
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aokblast wrote:

Emm, I test the Sections [] in the readobj output. But you are right, it is meaningless and I decide to just check like what we have done in many-sections test.

https://github.com/llvm/llvm-project/pull/165278