[lld] ELF: Introduce --shuffle-padding option. (PR #117653)

[Fangrui Song via llvm-commits]

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+# REQUIRES: x86
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MaskRay wrote:

bss/data/rodata can be merged into one test.

It's important to test an output section with multiple InputSectionDescription.

By default .rodata .text .data are in different PT_LOAD segments. The `os->ptLoad != curPtLoad` condition isn't covered by tests.

https://github.com/llvm/llvm-project/pull/117653