Merging r196100:

Merging r196100:
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r196100 | alp | 2013-12-02 06:17:47 -0800 (Mon, 02 Dec 2013) | 4 lines

Cut the gold plugin README down to size

This file hasn't been updated in years. Remove old information and point to
the current documentation at GoldPlugin.rst.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@196135 91177308-0d34-0410-b5e6-96231b3b80d8