Rui Ueyama 9c77d27004 Garbage-collect common symbols.
Liveness is usually a notion of input sections, but this patch adds
"liveness" bit to common symbols because they don't belong to any
input section.

This patch is based on https://reviews.llvm.org/D36520

Differential Revision: https://reviews.llvm.org/D36546

llvm-svn: 310617
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See docs/NewLLD.rst