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[COFF] clean up global resources after completion

Authored by ruiu on Jul 26 2018, 10:11 AM.

Description

[COFF] clean up global resources after completion

Patch by Andrew Kelley.

Previously, running lld::coff::link() twice in the same process would
access stale pointers because of these global variables not being reset.
After this patch, lld::coff::link() can be called any number of times,
just like its ELF and MACH-O counterparts.

Differential Revision: https://reviews.llvm.org/D49856

llvm-svn: 338042

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