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[ifcnv] Add comment explaining why it's OK to duplicate convergent MIs in ifcnv.

Authored by jlebar on Feb 22 2016, 9:51 AM.

Description

[ifcnv] Add comment explaining why it's OK to duplicate convergent MIs in ifcnv.

Summary:
Also add a comment briefly explaining what ifcnv is.

No functional changes.

Reviewers: resistor

Subscribers: echristo, tra, llvm-commits

Differential Revision: http://reviews.llvm.org/D17430

llvm-svn: 261543