Andrew Trick 2352abb7c6 Revert "indvars: sink truncates outside the loop."
This reverts commit r198654.

One of the bots reported a SciMark failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198659 91177308-0d34-0410-b5e6-96231b3b80d8
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