Reland r319090, "COFF: Do not create SectionChunks for discarded comdat sections." with a fix for debug sections.
If /debug was not specified, readSection will return a null
pointer for debug sections. If the debug section is associative with
another section, we need to make sure that the section returned from
readSection is not a null pointer before adding it as an associative
section.
Differential Revision: https://reviews.llvm.org/D40533
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319133
91177308-0d34-0410-b5e6-
96231b3b80d8
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