Fix mergefunc infinite loop
Self-referential constants containing references to a merged function
no longer cause the MergeFunctions pass to infinite loop. Also adds a
reproduction IR which would otherwise fail, which was isolated from a similar
issue in Chromium.
Author: jrkoenig
Reviewers: nlewycky, jfb
Subscribers: llvm-commits, nlewycky, jfb
Differential Revision: http://reviews.llvm.org/D11208
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242337
91177308-0d34-0410-b5e6-
96231b3b80d8
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