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[Attributor][FIX] Undo 16188f9 until SCC iterator bug is fixed

Authored by jdoerfert on Feb 21 2020, 2:18 PM.

Description

[Attributor][FIX] Undo 16188f9 until SCC iterator bug is fixed

The buildbot

http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win

shows some strange SCC iterator bug since 16188f9 which we need to
investigate. This patch should remove the part of 16188f9 that could
have exposed the problem.