Rafael Espindola d076482ab7 Revert 122011, 122012, 122013, 122023 adding back an important optimization.
I added a note, but suggestions on how to add a test are really welcome.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122138 91177308-0d34-0410-b5e6-96231b3b80d8
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