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[COFF] Fix crashes when writing a PDB after adding thunks.

Description

[COFF] Fix crashes when writing a PDB after adding thunks.

When writing a PDB, the OutputSection of all chunks need to be set.
The thunks are added directly to OutputSection after the normal
machinery that sets it for all other chunks.

This fixes part of PR40467.

Differential Revision: https://reviews.llvm.org/D57574

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