[LLD][ELF] - Do not produce an invalid dynamic relocation order with --shuffle-sections.

Normally (when not on android with android relocation packing enabled),
we put IRelative relocations to ".rel[a].dyn", after other relocations,
to ensure that IRelatives are processed last by the dynamic loader.

To achieve that we add the `in.relaIplt` after the `part.relaDyn`:
https://github.com/llvm/llvm-project/blob/master/lld/ELF/Writer.cpp#L540

The problem is that `--shuffle-sections` might break the sections order.
This patch fixes it.

Fixes https://bugs.llvm.org/show_bug.cgi?id=47056.

Differential revision: https://reviews.llvm.org/D85651